Document:

EXHIBIT
10.4 

[Geron Letterhead]

September 24, 2013

Stephen N. Rosenfield

[Home Address]

     RE:   First Amendment to Employment
Agreement

Dear Stephen:

By this First Amendment to your  Employment Agreement (the “First
Amendment”), you and the Company
agree to amend your Employment  Agreement, dated February 16, 2012 (the “Agreement”),
by deleting Section 3.2 of  the Agreement in its entirety and replacing it with the following:

     “3.2 Bonus. Executive shall
be eligible to earn, for each fiscal year of the Company ending during Executive’s employment with the Company,
an annual discretionary cash bonus (an “Annual Bonus”) targeted at forty-five percent (45%) of Executive’s Base
Salary. If the Company determines, in it reasonable discretion, that Executive has engaged in any misconduct intended to
affect the payment of his/her Annual Bonus, or has otherwise engaged in any act or omission that would constitute Cause for
termination of employment, as defined by Section 1.2 of the Agreement, Executive will automatically and immediately forfeit
his/her entire Annual Bonus. If the Annual Bonus has already been paid to Executive, such Annual Bonus will be deemed
unearned, and the Company shall have the right to recover the entire amount of the Annual Bonus paid to Executive for the
calendar year(s) in which such misconduct or other act or omission constituting Cause occurred. Without limiting the
foregoing, any such misconduct or other act or omission constituting Cause will subject Executive to disciplinary action up
to and including termination of employment. In addition, any Annual Bonus paid to Executive for the calendar year(s) in which
such misconduct or other Cause occurred is subject to recoupment in accordance with The Dodd–Frank Wall Street Reform
and Consumer Protection Act and any implementing regulations,
any other clawback policy adopted by the Company and any compensation recovery policy otherwise required by applicable
laws, regulations or statutes. Recovery by the Company of an Annual Bonus in accordance with this Section shall not
constitute an event giving rise to a right by Executive to voluntarily terminate his/her employment for cause based on such
recovery by Company, nor shall it constitute “constructive termination”, or any similar term or circumstance under
the Agreement or any other plan or agreement with the Company.”

In consideration for your execution of this First Amendment, your
employment by the Company will continue on the terms and conditions set forth in the Agreement, as amended hereby. In
addition, Section 4.1(ii)(d) of the Agreement shall be amended by deleting the word “subsequent” and replacing it with
the phrase “other (i.e. granted prior or subsequently to the date hereof)”, such that the amended Section shall
read:

     “(d) the Option, along with any other
options (i.e. granted prior or subsequently to the date hereof) or other exercisable equity interest in the Company held by
Executive, shall remain outstanding and exercisable through the earlier of (i) the second (2nd) anniversary of the date of
termination or (ii) the original expiration date of the option or other equity interest.”

Please sign below to indicate your
agreement hereto.

Sincerely,

	GERON CORPORATION			
		 			
	By: 	/s/ John A.
      Scarlett		September 24, 2013	 
		     John A. Scarlett,
      M.D.		Date	
		     Chief Executive
      Officer			
					

	ACKNOWLEDGED AND AGREED TO:			
	 			 
	Stephen N. Rosenfield	 	 	
	Print Name			 
	 			
	/s/
      Stephen N. Rosenfield		September 24, 2013	
	SignatureCOSR	
        $400,000
        PROMISSORY
        NOTE

         
	Interest free if paid in full within 3 months

 

 

FOR
VALUE RECEIVED,
Co-Signer,
Inc.,
a Nevada
corporation
(the
“Borrower”)
with
at least
112,000,000
common
shares
issued
and outstanding,
promises
to pay
to JMJ
Financial
or its Assignees
(the “Lender”)
the Principal
Sum along
with the
Interest
Rate and
any other
fees according
to the
terms
herein.
 This
Note
will become
effective only
upon execution
by both
parties and
delivery
of the
first payment
of Consideration
by the
Lender
(the
“Effective
Date”).

 

The
Principal
Sum is
$400,000
(four
hundred
thousand)
plus
accrued
and
unpaid
interest
and
any
other
fees. The
Consideration
is $360,000
(three
hundred
sixty
thousand)
payable
by wire
(there
exists
a $40,000
original
issue
discount
(the “OID”)).
The Lender
shall
pay $50,000
of Consideration
upon closing
of this
Note. 
The Lender
may pay
additional
Consideration
to the
Borrower
in such
amounts
and at
such
dates as
Lender
may
choose
in its sole
discretion.
THE PRINCIPAL
SUM DUE
TO LENDER
SHALL
BE PRORATED BASED
ON THE CONSIDERATION
ACTUALLY PAID
BY LENDER (PLUS
AN APPROXIMATE
10% ORIGINAL
ISSUE DISCOUNT
THAT IS
PRORATED BASED
ON THE CONSIDERATION
ACTUALLY PAID
BY THE LENDER
AS WELL
AS ANY OTHER
INTEREST OR FEES)
SUCH THAT THE
BORROWER IS
ONLY REQUIRED
TO REPAY THE
AMOUNT
FUNDED AND
THE BORROWER
IS NOT REQUIRED
TO REPAY
ANY UNFUNDED
PORTION
OF THIS
NOTE.  The
Maturity
Date is
one year
from the
Effective
Date of
each payment
(the “Maturity
Date”) and
is the
date upon
which the
Principal
Sum of this
Note, as
well as
any unpaid
interest
and other
fees, shall
be due and
payable.
 The Conversion
Price is
60% of the
lowest
trade price
in the
25 trading
days
previous
to the
conversion
(In the
case that
conversion
shares
are not deliverable
by DWAC
an additional
10% discount will
apply; and
if the
shares
are ineligible
for deposit
into
the DTC
system
and only
eligible
for Xclearing
deposit
an additional
5% discount
shall apply;
in the
case of
both
an additional
cumulative
15% discount
shall
apply).
Unless otherwise
agreed
in writing
by both
parties, at
no time will
the Lender
convert
any amount
of the
Note into
common
stock
that
would result
in the
Lender
owning
more than
4.99%
of the
common stock
outstanding.

 

1.
  ZERO
Percent
Interest
for
the
First
Three
Months.
 The
Borrower
may
repay
this
Note
at any
time on
or before
90 days
from the
Effective
Date,
after which
the Borrower
may not
make
further
payments
on this
Note prior
to the
Maturity
Date without
written approval
from Lender.
If the
Borrower repays the
Note on
or before
90 days from
the Effective
Date,
the Interest
Rate shall
be ZERO PERCENT
(0%).
If Borrower
does not
repay
the Note
on or
before
90 days
from
the Effective
Date,
a one-time
Interest
charge
of 12% shall
be applied
to the
Principal
Sum.  Any
interest
payable
is in addition
to the
OID,
and that
OID (or
prorated
OID,
if applicable)
remains
payable
regardless
of time
and manner
of payment
by Borrower.

 

2.
 Conversion.
The Lender
has
the
right,
at any
time
after the
Effective
Date,
at its
election, to
convert
all or
part
of the
outstanding
and
unpaid Principal
Sum and
accrued
interest
(and any
other fees) into
shares of fully
paid and
non-assessable
shares
of common stock
of the
Borrower
as per this
conversion
formula:
Number of
shares
receivable
upon conversion
equals
the dollar
conversion
amount divided
by the
Conversion
Price.
 Conversions
may be
delivered
to Borrower
by method
of Lender’s
choice
(including
but not limited
to email,
facsimile,
mail,
overnight
courier,
or personal
delivery),
and
all conversions
shall
be cashless
and
not require
further
payment
 from
the Lender.
 If no
objection
 is delivered
 from
Borrower
 to Lender
regarding
 any
variable
 or calculation
 of the
conversion
 notice
 within
24 hours
 of delivery
of the
conversion
 notice,
 the
Borrower
shall
 have
been thereafter
deemed
to have
irrevocably
 confirmed
 and
irrevocably
 ratified such
 notice
of conversion
and waived
any objection
thereto.
The Borrower
shall
deliver
the shares
from
any
conversion
to Lender
(in any
name
directed by
Lender)
within
3 (three)
business
days
of conversion
notice delivery.

    	

    	 

    

3.
 Conversion
Delays.
 If
Borrower
fails to
deliver
shares
in accordance
with
the
timeframe
stated in
Section
2, Lender,
at any
time prior
to selling
all of those
shares,
may rescind
any portion,
in whole
or in part,
of that
particular
conversion
attributable
to the
unsold
shares
and have
the rescinded
conversion
amount returned
to the
Principal
Sum with
the rescinded
conversion
shares
returned
to the
Borrower
(under
Lender’s
and
Borrower’s
expectations
that
any
returned
conversion
amounts
will
tack back
to the
original
date of
the Note).
In addition,
for
each conversion,
in the
event
that
shares
are not
delivered
by the
fourth
business
day (inclusive
of the
day of
conversion),
 a penalty
of $2,000
per day
will be
assessed
for each
 day after
 the third
 business
day (inclusive
of the
day of the
conversion)
until share
 delivery
is made;
and such
penalty
will be
added
to the
Principal
Sum  of
the Note
 (under
Lender’s
and Borrower’s
expectations
that
any penalty
amounts
will tack
back
to the
original
date of
the Note).

 

4.
 Reservation
 of Shares.
 At
all times
during
which
this
Note
is convertible,
the
Borrower
will
reserve
from
its authorized
and unissued
Common Stock
to provide
for the
issuance
of Common
Stock
upon the
full
conversion
of this
Note. The
Borrower
will at
all times
reserve at
least 5,000,000
shares
of Common
Stock
for conversion.

 

5.
 Piggyback
Registration
Rights.
 The
Borrower
shall
include
on the
next
registration
statement
the
Borrower
files with
SEC (or
on the
subsequent
registration
statement
if such
registration
statement
is withdrawn)
all shares
issuable
upon conversion
of this
Note. Failure
to do
so will
result
in liquidated
damages of
25% of
the outstanding
principal balance
of this
Note,
but not
less than
$25,000,
being
immediately
due and
payable
to the
Lender
at its election
in the
form
of cash
payment
or addition
to the
balance
of this
Note.

 

6.
 This
Section
Left
Intentionally
Blank.

 

7.
 Default.
 The
following
are events
of default
under
this
Note:
(i) the
Borrower
shall
fail to
pay
any
principal
under
the
Note
when due
and
payable
(or
payable
by conversion)
thereunder;
or (ii)
the Borrower
shall
fail to pay
any
interest
or any
other
amount under
the Note
when due
and payable
(or payable
by conversion)
thereunder;
or (iii) a receiver,
trustee
or other
similar official
shall
be appointed
over the
Borrower
or a material
part of
its assets and
such
appointment
 shall
remain
uncontested
 for twenty
(20) days
or shall
not be
dismissed
or discharged
within
sixty
(60)
days;
or (iv)
the Borrower
shall
become
insolvent
or generally
fails to
pay,
or admits
in writing
its inability
to pay,
its debts
as they
become
due,
subject
to applicable
grace periods,
if any;
or (v)
the
Borrower
shall
make
a general
assignment
 for
the benefit
 of creditors;
or (vi)
the Borrower
shall
file a petition
for relief
under any
bankruptcy,
insolvency
or similar
law (domestic
or foreign);
or (vii)
an involuntary
proceeding
shall
be commenced
or filed
against
the Borrower;
or (viii)
the Borrower
shall
lose
its status
as “DTC
Eligible”
or the
borrower’s
shareholders
shall
lose
the
ability
to deposit
(either
electronically
or by
physical certificates,
or otherwise)
shares
into
the
DTC System;
or (ix)
the
Borrower
shall
become
delinquent
in its filing
requirements
as a fully-reporting
issuer
registered
with
the SEC.

    	2

    	 

    

8.
 Remedies.
 In
the
event
of any
default,
the
outstanding
principal
amount
of this
Note,
plus
accrued
but unpaid
interest,
liquidated
damages,
fees and
other
amounts
owing
in respect
thereof
through
the
date of
acceleration, shall
become,
at the
Lender’s
election, immediately
due and
payable
in cash
at the
Mandatory
Default
Amount. The
Mandatory
Default
Amount
means
the
greater
of (i) the
outstanding
principal
amount
of this
Note, plus
all accrued
and
unpaid interest,
liquidated
damages,
fees and
other
amounts
hereon,
divided
by the
Conversion
Price
on the
date
the
Mandatory
Default
Amount is
either
demanded
or paid
in full,
whichever
has
a lower
Conversion
Price,
multiplied
by the
VWAP
on the
date
the
Mandatory
Default
Amount is
either
demanded
or paid
in full,
whichever
has a
higher
VWAP,
or (ii) 150%
of the
outstanding
principal
amount of
this
Note, plus
 100% of accrued
and 
unpaid interest,
liquidated
damages,
fees and
other
amounts
hereon.
Commencing
five (5)
days
after the
occurrence
of any
event
of default
that
results
in the
eventual
acceleration of
this
Note, the
interest
rate on
this
Note
shall
accrue
at an
interest
rate equal
to the
lesser of 18%
per
annum or
the
maximum
rate permitted
under applicable
law. In
connection
with
such
acceleration
described
herein,
the
Lender
need
not provide,
and
the
Borrower
hereby
waives,
any
presentment,
demand,
protest
or other
notice of
any
kind,
and
the
Lender
may immediately
and without
expiration
of any
grace
period
enforce
any and
all of its
rights
and remedies
hereunder
and all
other
remedies
available
to it under
 applicable
law. Such
 acceleration
 may
 be rescinded
and annulled
by Lender
at any
time prior
 to payment
hereunder
 and
the Lender
shall
have
all rights
as a holder
of the
note
until such
time,
if any,
as the
Lender
receives
full
payment
pursuant
to this
Section
 8. No
such
rescission or
annulment
shall
affect any
subsequent
 event
of default
 or impair
 any
right consequent
thereon.
Nothing
 herein
shall
limit
Lender’s
 right
to  pursue
any other
remedies
 available
 to 
it at law or
 in  equity
including,
without
limitation,
a decree of
specific
performance
and/or
injunctive
relief
with
respect
to the
Borrower’s
failure
to timely
deliver
certificates representing
shares
of Common
Stock
upon conversion
of the
Note
as required
pursuant
to the
terms
hereof.

 

9.
 No
Shorting.
 Lender
agrees
that
so long
as this
Note
from
Borrower
to Lender
remains
outstanding,
Lender
will
not enter
into
or effect
“short
sales” of
the
Common Stock
or hedging
transaction
which establishes
a net
short position
with respect
to the
Common Stock
of Borrower.
 Borrower
acknowledges
and agrees
that
upon delivery
of a conversion
notice by
Lender,
Lender
immediately
owns the
shares
of Common Stock
described
in the
conversion
notice and
any sale
of those
shares
issuable
under such
conversion
notice would
not be considered
short
sales.

 

10.
 Assignability.
 The Borrower
may
not assign
this
Note. 
This
Note
will
be binding
upon the
Borrower
and
its successors
and
will inure
to the
benefit
of the
Lender
and
its successors
and
assigns and
may
be assigned
by the
Lender
to anyone
of its choosing
without
Borrower’s
approval.

 

11.
 Governing
Law.
 This
Note
will
be governed
by, and
construed
and
enforced
in accordance
with,
the laws
of the
State
of Florida,
without
regard
to the
conflict
of laws
principles
thereof.
 Any action
 brought
 by either
party against
 the
other
concerning
the transactions
contemplated
by this
Agreement
 shall
be brought
only in
the state
courts
of Florida
or in
the federal
courts
located
in Miami-Dade
 County,
 in the
State 
of Florida.
 Both
 parties
and the
individuals
signing
 this
Agreement
agree
 to submit
 to the
jurisdiction
of such
courts.

 

12.
 Delivery
of Process
by Lender
to Borrower.
 In
the
event
of any
action
or proceeding
by Lender
against
Borrower,
and
only by
Lender
against
Borrower,
service
of copies
of summons
and/or
complaint
and/or
any
other
process
which
may
be served
in any
such
action or
proceeding
may
be made
by Lender
via U.S.
Mail, overnight
delivery
service
such
as FedEx
or UPS,
email, fax,
or process
server, or by
mailing
or otherwise
delivering
a copy
of such
process
to the
Borrower
at its last
known attorney
as set forth
in its most
recent SEC
filing.

 

13.
 Attorney
Fees.
In the
event
any
attorney
is employed
by either
party
to this
Note
with
regard
to any
legal
or equitable
action, arbitration
or other
proceeding
brought
by such
party for
the enforcement
of this
Note or
because
of an alleged
dispute,
breach,
default
or misrepresentation
in connection
with any
of the
provisions
of this
Note, the
prevailing
party in
such
proceeding
will
be entitled
to recover
from the
other
party reasonable
attorneys'
fees and
other
costs
and expenses
incurred,
in addition
to any
other
relief to which
the prevailing
party may
be entitled.

    	3

    	 

    

14.
 Opinion
of Counsel.
In the
event
that
an opinion
of counsel
is needed
for
any
matter
related to
this
Note,
Lender
has
the
right
to have
any
such
opinion
provided
by its counsel.
Lender
also has
the right
to have
any
such
opinion
provided
by Borrower’s
counsel.

 

15.
 Notices.
 Any
notice
required
or permitted
hereunder
(including
Conversion
Notices)
must
be in
writing
and
either
personally
served,
sent by
facsimile
or email
transmission,
or sent
by overnight
courier.
Notices
will be
deemed effectively
delivered
at the
time of
transmission
if by
facsimile
or email,
and if
by overnight
courier
the business
day after
such
notice is
deposited
with
the courier
service
for delivery.

 

[Signature
Page to
Follow]

    	4

    	 

    

 

	Borrower:	Lender:
	 	 
	/s/ Darren Magot	/s/ Authorized Signatory
	Co-Signer, Inc.	JMJ Financial
	Chief Executive Officer	Its Principle
	 	 
	Date: 9/23/2013	Date: 9/23/2013

 

[Signature
Page to
$400,000
Promissory
Note]

    	5

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