Document:

Exhibit 10.35

                                                                      One of two

March 23, 2000

Dr. Jurek Koziol
24 Colburn Lane
Hollis, NH 03049

Dear Jurek,

It is my pleasure to offer you the position of Vice President  Technical Manager
for Semitool, Inc. reporting to me. The terms of this offer are as follows:

1.     Your base  salary will be $155k per year paid  semi-monthly  with a start
       date as soon as possible,  but no later than May 1, 2000. This offer will
       expire on May 1, 2000. As a member of management  you will be eligible to
       participate in the Management Bonus Plan.

2.     The company will assist in your move from NH to MT with a lump sum of
       $40,000.00 to cover the move of household goods, and other related
       expenses relocating your family to the area. Some of this amount will be
       taxable dependent upon actual moving expenses. The company will be
       involved in these items to help secure the best possible price for you.
       We will also provide temporary housing for the first six months, and
       until your family is relocated you may work one week a month out of the
       New Hampshire office, this is limited to the first three months. You will
       have either a company car for your business and personal use or a monthly
       allowance of $600 toward a lease or purchase. To help you determine where
       you want to reside in the Flathead Valley, Semitool will cover the cost
       of two house-hunting trips for your family. We request that they be
       scheduled in advance with a Saturday night stay to secure the best
       possible price.

3.     As part of your incentive package you will be granted 20,000 stock option
       shares.  Following Board approval, it will be issued and vested according
       to the current stock option plan.  The exercise price of the stock option
       will be set the day it is approved.

4.     You will receive four weeks vacation within the first year of employment
       and every year thereafter. Vacation is subject to company scheduling and
       prior approval.

5.     You will be eligible for all benefits offered to Semitool  employees some
       have  waiting  periods  (Insurance  the  first  of  the  month  following
       employment, the 401(k) next entrance date is 4/1/2000.)

6.     As a condition of employment you will be required to sign a
       confidentiality conflict of interest agreement.

7.     While  you  are  employed  at  Semitool  to  further   your   educational
       development  for your  position,  Semitool  agrees to pay one half of the
       tuition and books costs of obtaining a Masters of Business Administration
       degree  through the U of M. The MBA program will be pursed on a part-time
       non-traditional student basis. In exchange for this support, you agree to
       commit to one year of service to Semitool  following  confirmation of the
       degree.  If you leave Semitool before  completion of the degree you agree
       to repay 50% of the costs  incurred by Semitool.  If you resign after the
       degree is conferred  and before one year of service is completed you will
       repay Semitool all costs they have paid.

<PAGE>

                                                                      Two of two
                                                                Koziol - 3/23/00

8.     If your employment is terminated either by you or by Semitool after three
       months of  employment,  Semitool  will pay you severance in the amount of
       $12,900.00 a month each month after such  termination for a period of six
       months  or until  the  date on which  you  accept  employment  elsewhere,
       whichever comes first.

9.     If Semitool  should  require you to relocate  from  Kalispell for company
       business  purposes,  the  company  will  provide  an  equitable  transfer
       allowance.

10.    None of the terms of this offer represents an agreement by you or
       Semitool, Inc. for any specific length of employment. Either you or
       Semitool may, at any time, terminate the employment relationship upon
       notice to the other party.  As with all Semitool employment positions,
       there is a 90 day probationary period.

       Any controversy or claim arising out of termination of employment after
       your probationary period has expired shall be settled by arbitration as
       provided in Montana's Uniform Arbitration Act, 27-5-211 et seq., MCA. The
       laws of Montana shall apply.

Sincerely,                               Acceptance: I have read and understand
                                         All of the above and accept these terms
                                         of Employment with Semitool.

/s/Raymon F. Thompson                    /s/Jurek Koziol
-------------------------                -------------------------
Ray Thompson                             Dr. Jurek Koziol
Chief Executive Officer                  Date:3/26/00<PAGE>   1

                                                                    EXHIBIT 10.1

                                    AMENDMENT

        This is an Amendment dated as of May 22, 2000 to the Employment
Agreement ("Agreement") dated May 22, 1998 by and between OrthAlliance, Inc.
("Company") and Stephen M. Toon ("Employee").

        1. Capitalized terms not otherwise defined herein shall have the same
meaning as contained in the Agreement.

        2. The term of the Agreement is hereby extended until August 31, 2002.

        3. Exhibit A to the Agreement was modified during the term of the
Agreement and an updated Exhibit A is attached hereto and incorporated herein.

        4. Except as otherwise provided herein, the Agreement remains in full
force and effect.

        In witness whereof, the parties have entered into this Amendment as of
the date first written above.

OrthAlliance, Inc.

By:     /s/ Paul H. Hayase              /s/ Stephen M. Toon
   --------------------------------     -----------------------------------
Title:  Senior Vice President           Stephen M. Toon

<PAGE>   2

                                    Exhibit A

        Employee is eligible to receive compensation for his solicitation and
enrollment of new orthodontic and pediatric dental practices ("Prospect
Practices") that affiliate with the Company pursuant to the following terms:

        1.      Acceptance of Prospect Practices.

                In order to affiliate with the Company, Prospect Practices must
provide such information and documentation and execute such agreements and
documentation as the Company may require from time to time. The acceptance of
such information, agreements and documentation from all Prospect Practices shall
be subject to the approval of Company and Company, in its sole discretion, may
withhold such approval.

        2.      Terms of Affiliation.

                Company shall have the right, in its sole discretion, to
determine the terms and conditions for the Prospect Practices to affiliate with
the Company and Company may change such terms and conditions in any respect at
any time without prior notice to Employee.

        3.      Computation of Commissions.

                Subject to the next paragraph, Employee shall be paid a
commission, of an amount equal to up to Two Percent (2%) of the Adjusted Gross
Revenue for each Prospect Practice in the territory assigned to Employee from
time to time by the Company ("Territory") that affiliates with the Company
during the term of this Agreement. As used herein, a Prospect Practice will not
be deemed to have affiliated with the Company unless and until all of the
information, contracts and documentation required by the Company have been
accepted by the Company as set forth in Section 1 above and all necessary
government filings and approvals have been completed and obtained. As used
herein, Adjusted Gross Revenue shall mean the Prospect Practice's annual
adjusted gross revenue used by the Company for valuation purposes.

                Company shall have the right to recruit Prospect Practices
through any and all avenues, including but not limited to the efforts of its
affiliated orthodontists and pediatric dentists to recruit Prospect Practices in
the Territory and the use of other recruitment representatives in the Territory.
In the event that the Company is required to pay any commissions, fees or other
amounts to any other persons or entities in connection with the solicitation and
recruitment of any Prospect Practice in the Territory, the Prospect Practice
shall be deemed to be a "split account," and the amount of the commission
payable to the Representative for such Prospect Practice shall be reduced. The
President and CEO of the Company shall determine in his sole discretion the
amount of the reduction of the commission that would have been determined
payable pursuant to this Section 3 for such split account.

<PAGE>   3

        4.      Stock Options.

                Employee shall be entitled to receive stock options to purchase
shares of Class A Common Stock of the Company for each Prospect Practice that
affiliates with the Company, provided that the Company's Class A Common Stock is
publicly traded. The number of options shall be an amount equal to .002 times
the Adjusted Gross Revenue of the applicable Prospect Practice. By way of
example and not limitation, Employee would receive a stock option for Two
Thousand (2,000) shares of Class A Common Stock when a Prospect Practice with
Adjusted Gross Revenue of One Million Dollars ($1,000,000) affiliates with the
Company (.002 x 1,000,000 = 2,000). Subject to the terms of the applicable stock
option plan, (i) the stock options will be granted as of the closing date of the
affiliation of the Prospect Practice, (ii) the options will vest twenty percent
(20%) on the date of grant and twenty percent (20%) per year on each anniversary
of the date of grant and (iii) the exercise price for the stock options shall be
the closing price on the date of grant.

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