Document:

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                                                                  EXHIBIT 10.45

January 22, 2001

Gerald J. Baker
3650 131st Avenue SE
Bellevue, WA 98006

Dear Jerry:

This letter (the "Letter Agreement") sets forth the terms of your employment
with Western Wireless Corporation ("WWC"), effective February 1, 2001.

1.      Your title will be Senior Vice President, Engineering and Technical
        Operations. In that capacity you will report to the President of WWC
        (the "President").

2.      Your responsibilities will include supervision of all engineering and
        technical operations functions, together with such other duties as may
        be assigned to you by the President. You will devote substantially all
        of your business time and attention to the obligations delineated in
        this Letter Agreement.

3.      Your base compensation will be $150,000, payable in accordance with
        standard payroll practices of WWC. In addition, you will have an
        opportunity, as determined by WWC, to earn a performance bonus targeted
        at $60,000 per year, to be paid quarterly. You will also receive options
        to purchase 25,000 shares of WWC's common stock in connection with the
        Company's FY2001 option grant, and will be eligible to continue, during
        the course of your employment, participation in the option program at a
        level to be determined by WWC. Your options will have a 4-year vesting
        and shall contain change of control language consistent with other
        officers of WWC. It is understood that nothing contained herein will
        prevent WWC, in its sole and absolute discretion, from, at any time,
        increasing your compensation, either permanently or for a limited
        period, whether in base compensation, by bonus or otherwise, if WWC in
        its sole discretion, shall deem it advisable to do so in order to
        recognize and fairly compensate you for the value of your services to
        WWC; provided, however, that nothing contained in this paragraph three
        shall in any manner obligate WWC to make any such increase or provide
        any such additional compensation or benefits.

4.      WWC will reimburse you for all reasonable out-of-pocket business
        expenses paid or incurred by you in connection with the performance of
        your duties, upon submission of signed, itemized lists of such expenses
        on general forms established for that purpose by WWC.

5.      You will be entitled to participate in all group health and insurance
        programs and all other fringe benefit or retirement plans or other plans
        effective generally with respect to executives of WWC.

6.      To the extent you have been granted Performance Units in the Western
        Wireless International Corporation 1998 Stock Appreciation Plan
        (hereinafter "Plan") as of the date of this letter, those Units will
        continue to vest during your employment with WWC and be governed by the
        terms and conditions of the Plan. As set forth in the Plan, if you
        terminate your employment with WWC and any of its subsidiaries,
        including Western Wireless International, your rights with respect to
        the Units will terminate and be forfeited.

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7.      WWC will enter into an Indemnification Agreement with you pursuant to
        which WWC will agree to indemnify you against certain liabilities
        arising by reason of your affiliation with WWC.

8.      (a) Notwithstanding any other provision of this Letter Agreement, your
        employment by WWC may be terminated by WWC at any time, with or without
        Cause, as defined below. In the event of a termination for Cause you
        will have no rights to severance payments. Termination for "Cause" means
        (i) your gross neglect or willful material breach of your principal
        employment responsibilities or duties, (ii) a final judicial
        adjudication that you are guilty of a felony, (iii) fraudulent conduct
        as determined by a court of competent jurisdiction in the course of your
        employment with WWC or any of its subsidiaries, (iv) the breach by you
        of the covenant set forth in paragraph nine, below, or (v) the material
        breach by you of any other provision of this Letter Agreement which
        continues uncured for a period of thirty (30) days after notice thereof
        by WWC. In the event of your voluntary termination of employment with
        WWC, you will have no rights to severance benefits.

        (b) In the event of an involuntary termination for other than Cause
        (which shall include your resignation as a direct result of (i) a
        reduction in your base compensation and/or incentive bonus target
        percentage, or (ii) the material breach by the Company of any provision
        of this Letter Agreement which continues uncured for a period of thirty
        (30) days after notice thereof by you), then (A) you will be entitled to
        receive a severance payment in an amount equal to your accrued but
        unpaid existing annual targeted incentive bonus through the date of
        termination, 6 months of your then base compensation and an amount equal
        to 6 months of your existing annual targeted incentive bonus; (B) WWC
        will, at its expense, make all COBRA benefit payments on behalf of you
        and your dependents for six (6) months following such involuntary
        termination; and (C) with respect to any stock options previously
        granted to you by WWC which remain unvested at the time of the
        involuntary termination, notwithstanding the vesting language in the
        stock option agreement pursuant to which such options were granted,
        there shall be immediate vesting of that portion of each such grant of
        unvested stock options as equals the product of the total number of such
        options under such grant which remain unvested multiplied by a fraction
        the numerator of which is the sum of (i) the number of days from the
        date on which the last vesting of options under such grant took place to
        and including the date on which the termination occurs plus (ii) 183 and
        the denominator of which is the number of days remaining from the date
        on which the last vesting of options under such grant took place to and
        including the date on which the final vesting under such grant would
        have occurred.

        Your death or permanent disability will be deemed an involuntary
        termination for other than Cause. "Permanent disability" shall mean your
        inability substantially to render the services required hereunder for
        eight (8) months in any eighteen (18) month period because of a physical
        or mental condition, it being understood that until you have received
        notice from WWC terminating this Letter Agreement, you will continue to
        receive your base compensation and all other benefits to which you are
        entitled under this Letter Agreement.

        (c) You agree that upon termination of your employment by WWC for any
        reason you will surrender to WWC all proprietary records, lists and
        other documents obtained by you or entrusted to you during the course of
        your employment by WWC, together with all copies of all such documents.

9.      You agree not to disclose at any time, whether during the term of this
        Letter Agreement or thereafter, any secret or confidential information
        relating to WWC's or any of its subsidiaries' businesses, financial
        condition or prospects, which information you have obtained while
        employed by WWC or by any of its subsidiaries or any of the predecessors
        in interest of any of

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        them, except (i) as may be required in furtherance of the businesses of
        WWC or of any of its subsidiaries, (ii) with WWC's express prior written
        consent, (iii) if such information is made generally available to the
        public through no fault of yours, or (iv) if such disclosure is required
        by applicable law or regulation or by legal process and then only with
        prompt written notice to WWC in advance of any such disclosure.

10.     You agree that, during the term of your employment by WWC and for a
        period of one (1) year immediately following the termination of your
        employment with WWC for any reason whatsoever, you will not, either
        directly or indirectly, for compensation or any other consideration,
        individually or as an employee, broker, agent, consultant, lender,
        contractor, advisor, solicitor, stockholder (provided that ownership of
        5% or less of the outstanding stock of any corporation listed on a
        national securities exchange is not prohibited), proprietor, partner, or
        person having any other material economic interest in, affiliated with
        or rendering services to any other entity, engage in or provide services
        to or for a business that is substantially the same as or similar to
        WWC's or its subsidiaries businesses and which competes within the
        applicable commercial mobile radio services markets serviced by WWC or
        its subsidiaries, directly or indirectly.

11.     This Letter Agreement contains the entire agreement between you and WWC
        with respect to your employment by WWC, other than human resource and
        corporate policies which are to be executed by all employees. This
        Letter Agreement may not be amended, waived, changed, modified or
        discharged except by an instrument in writing executed by or on behalf
        of you and WWC.

12.     All notices, requests, demands and other communications with respect to
        this Letter Agreement will be in writing and will be deemed to have been
        duly given if delivered by hand, registered or certified mail (first
        class postage and fees prepaid, return receipt requested), telecopier or
        overnight courier guaranteeing next-day delivery, as follows:

        a)      to WWC:
                Western Wireless Corporation
                3650 - 131st Avenue SE, #400
                Bellevue, Washington  98006
                Attention:  President
                Telecopier:  (425) 586-8102

        b)      to you:
                Gerald J. Baker
                3650 131st Avenue SE
                Bellevue, WA 98006

        and/or to such other persons and addresses as either you or WWC has
        specified in writing to the other by notice as aforesaid.

13.     If any part of this Letter Agreement is hereafter construed to be
        invalid or unenforceable in any jurisdiction, the same will not affect
        the remainder of the Letter Agreement or the enforceability of such part
        in any other jurisdiction, which will be given full effect, without
        regard to the invalid portions or the enforceability in such other
        jurisdiction. If any part of this Letter Agreement is held to be
        unenforceable because of the scope thereof, you and WWC agree that the
        court making such determination will have the power to reduce the
        duration and/or area of such provision and,

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        in its reduced form, said provision shall be enforceable; provided,
        however, that such court's determination will not affect the
        enforceability of this Letter Agreement in any other jurisdiction beyond
        such court's authority.

14.     This Letter Agreement will be governed by and construed and interpreted
        in accordance with the laws of the State of Washington without reference
        to conflicts of laws principles.

Please signify your acceptance of the terms of this Letter Agreement by signing
where indicated below.

                                              Sincerely yours,

                                              WESTERN WIRELESS CORPORATION

                                              By: /s/ Mikal J. Thomsen
                                                  ----------------------------
                                                      Mikal J. Thomsen
                                                      President

AGREED TO AND ACCEPTED:

 /s/ Gerald J. Baker
-----------------------------------
Gerald J. Baker<PAGE>   1

                                                                    EXHIBIT 10.1

                     AMENDMENT TO STOCK PURCHASE AGREEMENT

        This Amendment to Stock Purchase Agreement (this "Amendment") is made as
of the 18th day of April, 2001 between ChromaVision Medical Systems, Inc., a
Delaware corporation (the "Company"), and VennWorks LLC, a Delaware limited
liability company formerly named incuVest LLC, (the "Purchaser").

RECITALS

        The Company and the Purchaser are parties to a Stock Purchase Agreement
made as of January 31, 2001 (the "Stock Purchase Agreement") providing for the
purchase by the Purchaser from the Company of $5,000,000 in aggregate purchase
price of shares of Common Stock of the Company on the terms and at the dates set
forth in the Stock Purchase Agreement. The parties now desire to amend the Stock
Purchase Agreement on the terms set forth in this Amendment.

AMENDMENT

        The parties hereby agree that the Stock Purchase Agreement shall be
amended as follows:

        1. Section 3 of the Stock Purchase Agreement is amended to read in full
as follows:

                "The Company has requested, pursuant to the Stock Purchase
        Agreement, that the Purchaser purchase the first $2,000,000 of aggregate
        purchase price of shares of the Company's Common Stock. Such purchases
        shall be made (without further request or notice from the Company) of
        the numbers of shares which have the aggregate purchase prices set forth
        below on the dates set forth below:

                        (a)     $100,000 on each of April 23 and April 27, 2001;

                        (b)     $200,000 on each of May 4, May 11, May 18 and
                                May 25, 2001; and

                        (c)     $250,000 on each of June 1, June 8, June 15 and
                                June 22, 2001.

                The number of shares to be purchased in each of the weekly
        purchases referred to above shall be determined by dividing the
        aggregate purchase price for that particular purchase set forth above by
        the greater of (i) $7 plus interest thereon at the rate of 8% per annum
        from April 20, 2001 until the date the shares are purchased or (ii) the
        average of the closing prices per share of Common Stock on the Nasdaq
        National Market for each of the twenty trading days ending three
        business days before the date of each such purchase but in no event more
        than $14 per share. For purposes of (i) above, the increase in the $7
        per share price resulting from the interest shall be rounded to the
        nearest one-hundredth of one cent, and in the event the foregoing
        results in a fractional share for the aggregate purchase on any day, the
        fraction shall be rounded down and the purchase price of the fractional
        share shall not be paid. In the event the shares of Company

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        Common Stock are no longer quoted on the Nasdaq National Market, the
        purchase price shall be determined in like manner by reference to the
        principal market where the shares are then quoted for each day in the
        twenty day trading period. If the shares do not trade on any of the
        twenty trading days referred to above, that day shall be ignored in
        calculating the average. Each date set forth in (a) through (c) above
        shall be deemed to be a Closing Day for purposes of the Stock Purchase
        Agreement, as amended by this Amendment.

                In addition, the Company will have the right to request that the
        Purchaser purchase shares having up to the maximum aggregate price set
        forth below during the periods set forth below:

                        (A) $4,000,000 on a Closing Date between July 1, 2001
                and September 28, 2001 less the aggregate purchase price of the
                shares, if any, purchased pursuant to (a) through (c) above; and

                        (B) $5,000,000 on a Closing Date between October 1, 2001
                and December 28, 2001 less the aggregate purchase price of the
                shares, if any, purchased pursuant to (a) through (c) and (A)
                above."

        Section 4 of the Stock Purchase Agreement shall apply only to purchases
pursuant to (A) and (B) above. The failure of the Company to exercise its option
to request the purchase of any of the shares referred to in (A) or (B) above
shall not affect its right to request the purchase of shares during any later
period, except that in no event will the Company have the right to request the
purchase of shares on a Closing Date after December 28, 2001. The purchase price
of shares purchased pursuant to (A) and (B) shall be the amount set forth in
Section 2 of the Agreement.

        2. Acceleration for Default. In the event of an Event of Default the
Company will have the right at any time thereafter to request that Purchaser
purchase the entire amount of shares referred to in Section 1 of this Amendment
(including the shares referred to in (a) through (c) as well as (A) and (B) of
said Section 1) to the extent they have not been previously purchased. The
Closing Date for any such purchase shall be three business days after the giving
of written notice by the Company to the Purchaser of its election to exercise
its rights under this Section 2. "Event of Default" means any of the following:
(i) any default in the performance of any obligation under this Agreement which
is not cured within fifteen (15) days after delivery of written notice of the
default by the Company to Purchaser and (ii) any inaccuracy in any
representation or warranty made by Purchaser pursuant to Section 4(a) through
(c) of this Amendment or pursuant to the Stock Purchase Agreement.

        3. Closing of Purchases. Section 5 of the Stock Purchase Agreement is
hereby amended to read in full as follows:

                "The closing of each purchase and sale of shares shall be held
        on the Closing Date for the purchase specified in Section 3 (as amended
        by Section 1 of this Amendment). Each closing will be accomplished by
        the delivery of immediately available funds in the amount of the
        purchase price to be paid by wire transfer to the account of the
        Company. Promptly upon being notified by its

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        bank of receipt of the funds by wire transfer, the Company will cause a
        certificate for the shares purchased to be delivered to the Purchaser by
        hand delivery or by recognized overnight courier at 530 Madison Avenue,
        New York, N.Y 10017. The wire transfer shall be sent in accordance with
        the following instructions or such other instructions as the Company may
        provide to the Purchaser in writing at least two business days prior to
        the date any such wire transfer is to be sent:

                               Bank of America
                               ABA #121000358
                               Account #14178-03031
                               Account Name:  ChromaVision Medical Systems, Inc"

        4. Representations and Warranties of the Purchaser. The Purchaser hereby
represents and warrants to the Company as follows:

                (a) As of April 6, 2001 and as of the date of this Agreement the
        Purchaser does not have in its possession or subject to its control the
        $2,000,000 in cash or cash equivalents (as defined in accordance with
        generally accepted accounting principles) required to meet its
        obligations under Section 3(a) of the Stock Purchase Agreement as in
        effect prior to this Amendment. Purchaser represents and warrants to the
        Company that approximately $4 million in cash reflected on its balance
        sheet is subject to the terms of an agreement or agreements with HSBC
        that prohibit its use to purchase the Company's Common Stock.

                (b) Each of the financial statements delivered by the Purchaser
        shall have been prepared in accordance with generally accepted
        accounting principles consistently applied except that the footnote
        disclosure required by generally accepted accounting principles shall
        not be required.

                (c) All of the representations and warranties set forth in the
        Stock Purchase Agreement are true and correct as of the date of this
        Amendment.

        5. Representations and Warranties of the Company. The Company represents
and warrants that all of its representations and warranties set forth in the
Stock Purchase Agreement are true and correct as of the date of this Amendment.

        6. Obligation to Provide Financial Statements. Concurrently with the
execution and delivery of this Amendment, the Purchaser is providing to the
Company its most recent available financial statements consisting of an income
statement, balance sheet and statement of cash flows, which shall be as of a
date not earlier than February 28, 2001 and for the monthly period then ended
and the calendar year to date. The Company agrees to keep the financial
statements confidential and not to make them available or disclose the contents
thereof to any person or entity except to its Chief Executive Officer, Chief
Financial Officer and outside legal counsel, except as required by law and
except that the Company can provide a verbal summary of the contents of the
financial statements to its Board of Directors.

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        7. Unconditional Nature of Purchaser's Obligation. Purchaser
acknowledges that this Amendment is being entered into because Purchaser is
unable to meet its obligations to purchase $2;,000,000 in aggregate purchase
price of shares of Company Common Stock in accordance with the terms of the
Stock Purchase Agreement. Purchaser agrees that its obligation to purchase the
shares pursuant to this Amendment is unconditional and will not be affected by
any change in the business, financial condition, results of operations or
prospects of the Company, whether occurring before or after this Agreement.
Purchaser further acknowledges that the Company has made no representation or
warranty, express or implied, to the Purchaser except as specifically set forth
in this Agreement and has provided to the Purchaser all information and
documents and answered all questions asked by the Purchaser in order for the
Purchaser to evaluate this Amendment and the Stock Purchase Agreement and the
risks to it of the transactions contemplated hereby and thereby.

        8. Continued Effect of Stock Purchase Agreement. Except as amended
hereby, the Stock Purchase Agreement shall remain in full force and effect.

        9. Counterparts. This Amendment may be executed in two or more
counterparts, each of which shall constitute an original, but all of which, when
taken together, shall constitute but one instrument, and shall become effective
when one or more counterparts have been signed by each of the parties hereto and
delivered to the other party by telephone facsimile, personal delivery, delivery
by overnight courier of recognized standing or by first class U.S. mail.

        IN WITNESS WHEREOF the parties have caused this Amendment to be executed
by the duly authorized representatives as of the day and year first above
written.

CHROMAVISION MEDICAL SYSTEMS, INC.          VENNWORKS LLC

By:                                         By:
   -------------------------------             ---------------------------------
Name:                                       Name:
     -----------------------------               -------------------------------
Title:                                      Title:
      ----------------------------                ------------------------------

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