<SEC-DOCUMENT>0001527802-11-000002.txt : 20110811
<SEC-HEADER>0001527802-11-000002.hdr.sgml : 20110811
<ACCEPTANCE-DATETIME>20110811150955
ACCESSION NUMBER:		0001527802-11-000002
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20110808
FILED AS OF DATE:		20110811
DATE AS OF CHANGE:		20110811

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CLARKE DAVID
		CENTRAL INDEX KEY:			0001527802

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35083
		FILM NUMBER:		111027498

	MAIL ADDRESS:	
		STREET 1:		C/O GSI GROUP INC.
		STREET 2:		125 MIDDLESEX TURNPIKE
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GSI GROUP INC
		CENTRAL INDEX KEY:			0001076930
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES [3690]
		IRS NUMBER:				980110412
		STATE OF INCORPORATION:			A3
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		125 MIDDLESEX TURNPIKE
		STREET 2:		.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730
		BUSINESS PHONE:		781-266-5700

	MAIL ADDRESS:	
		STREET 1:		125 MIDDLESEX TURNPIKE
		STREET 2:		.
		CITY:			BEDFORD
		STATE:			MA
		ZIP:			01730

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GSI LUMONICS INC
		DATE OF NAME CHANGE:	19990401

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GSI LUMONICS
		DATE OF NAME CHANGE:	19990331

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LUMONICS INC
		DATE OF NAME CHANGE:	19990115
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-08-08</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001076930</issuerCik>
        <issuerName>GSI GROUP INC</issuerName>
        <issuerTradingSymbol>GSIG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001527802</rptOwnerCik>
            <rptOwnerName>CLARKE DAVID</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GSI GROUP INC.</rptOwnerStreet1>
            <rptOwnerStreet2>125 MIDDLESEX TURNPIKE</rptOwnerStreet2>
            <rptOwnerCity>BEDFORD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01730</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Restricted Stock Units</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each Restricted Stock Unit represents the right to receive one GSI Group Inc. common share upon vesting of such Restricted Stock Unit</footnote>
        <footnote id="F2">The Restricted Stock Units vest in three equal annual installments on March 31, 2012, March 31, 2013 and March 31, 2014.</footnote>
    </footnotes>

    <remarks>Exhibit 24 - Power of Attorney attached</remarks>

    <ownerSignature>
        <signatureName>Paula A Pluta, Attorney-in-fact</signatureName>
        <signatureDate>2011-08-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>clarkedavidpoa.txt
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
POWER OF ATTORNEY




      Know all by these presents that the
undersigned hereby constitutes and appoints Robert
Buckley, Paula A. Pluta and Joanna Tow as his true
and lawful attorneys-in-fact to:
(1)	execute for and on behalf of
the undersigned Forms 3, 4
and 5 in accordance with
Section 16(a) of the
Securities Exchange Act of
1934, as amended, and the
rules thereunder, for and in
relation to any and all
reportable transactions in the
securities of GSI Group, Inc.;
(2)	do and perform any and all
acts for and on behalf of the
undersigned which may be
necessary or desirable to
complete the execution of
any such Form 3, 4 and 5 and
timely filing of such forms
with the United States
Securities and Exchange
Commission and any other
authority; and
(3)	take any other action of any
type whatsoever in
connection with the
foregoing which, in the
opinion of such attorneys-in-
fact, may be of benefit to, in
the best interest of, or legally
required by, the undersigned,
it being understood that the
documents executed by such
attorneys-in-fact on behalf of
the undersigned pursuant to
this Power of Attorney shall
be in such form and shall
contain such terms and
conditions as such attorneys-
in-fact may approve in their
discretion.
      The undersigned hereby grants to each
attorney-in-fact, individually, full power and
authority to do and perform all and every act and
thing whatsoever requisite, necessary and proper to
be done in the exercise of any of the rights and
powers herein granted, as fully to all intents and
purposes as each attorney-in-fact might or could do
if personally present, with full power of substitution
or revocation, hereby ratifying and confirming that
each attorney-in-fact, or his substitute or substitutes,
shall lawfully do or cause to be done by virtue of
this power of attorney and the rights and powers
herein granted.  The undersigned acknowledges that
the foregoing attorneys-in-fact, in serving in such
capacity at the request of the undersigned, are not
assuming any of the undersigned's responsibilities
to comply with Section 16 of the Securities
Exchange Act of 1934, as amended.
      IN WITNESS WHEREOF, the undersigned
has caused this Power of Attorney to be executed as
of this 9th day of August, 2011.


/s/ David Clark
Signature

David Clarke
Print Name
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
