UNITED STATES
                  SECURITIES AND EXCHANGE COMMISSION
                        WASHINGTON, D.C. 20549

                             SCHEDULE 13G
                             (Rule13d-102)


               UNDER THE SECURITIES EXCHANGE ACT OF 1934

                          (Amendment No. __)


                           GSE SYSTEMS, INC.
                           -----------------
                           (Name of Issuer)

                Common Stock, $.01 par value per share
                --------------------------------------
                    (Title of Class of Securities)

                               36227K106
                            --------------
                            (CUSIP Number)

                             June 22, 2007
        -------------------------------------------------------
        (Date of Event Which Requires Filing of This Statement)

        Check the appropriate box to designate the rule pursuant to which
this Schedule is filed:

          [X]   Rule 13d-1(b)

          [ ]   Rule 13d-1(c)

          [ ]   Rule 13d-1(d)


        *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.

        The information required in the remainder of this cover page shall
not be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, see the Notes).



CUSIP NO. 36227K106                  SCHEDULE 13G                 PAGE 2 OF 7


1    Name of Reporting Person               Westcliff Capital Management, LLC

     IRS Identification No. of Above Person                    EIN 77-0435868

2    Check the Appropriate Box if a member of a Group                (a)  [ ]

                                                                     (b)  [ ]

3    SEC USE ONLY

4    Citizenship or Place of Organization                          California

   NUMBER OF        5    Sole Voting Power                                  0
     SHARES
  BENEFICIALLY      6    Shared Voting Power                        1,609,234
 OWNED BY EACH
   REPORTING        7    Sole Dispositive Power                             0
  PERSON WITH
                    8    Shared Dispositive Power                   1,609,234

9    Aggregate Amount Beneficially Owned by Each Reporting Person   1,609,234

10   Check Box if the Aggregate Amount in Row (9) Excludes Certain
     Shares                                                               [ ]

11   Percent of Class Represented by Amount in Row 9                   10.80%

12    Type of Reporting Person                                             IA



CUSIP NO. 36227K106                  SCHEDULE 13G                 PAGE 3 OF 7


1    Name of Reporting Person                          Richard S. Spencer III

     IRS Identification No. of Above Person

2    Check the Appropriate Box if a member of a Group                (a)  [ ]

                                                                     (b)  [ ]

3    SEC USE ONLY

4    Citizenship or Place of Organization                       United States

   NUMBER OF        5    Sole Voting Power                                  0
     SHARES
  BENEFICIALLY      6    Shared Voting Power                        1,609,234
 OWNED BY EACH
   REPORTING        7    Sole Dispositive Power                             0
  PERSON WITH
                    8    Shared Dispositive Power                   1,609,234

9    Aggregate Amount Beneficially Owned by Each Reporting Person   1,609,234

10   Check Box if the Aggregate Amount in Row (9) Excludes Certain
     Shares                                                               [ ]

11   Percent of Class Represented by Amount in Row 9                   10.80%

12   Type of Reporting Person                                          HC, IN




CUSIP NO. 36227K106                  SCHEDULE 13G                 PAGE 4 OF 7


Item 1(a).  Name of Issuer:

            GSE Systems, Inc.

Item 1(b).  Address of Issuer's Principal Executive Offices:

            7133 Rutherford Road, Suite 200, Baltimore, MD 21244

Item 2(a).  Names of Persons Filing:

            Westcliff Capital Management, LLC ("Westcliff LLC") and Richard S.
            Spencer III ("Spencer", and collectively, the "Filers").

            Westcliff LLC and Spencer disclaim beneficial ownership of the
            Stock (as defined below) except to the extent of their respective
            pecuniary interests therein.

Item 2(b).  Address of Principal Business Office or, if none, Residence:

            200 Seventh Avenue, Suite 105, Santa Cruz, CA  95062

Item 2(c).  Citizenship:

            See Item 4 of the cover page for each Filer.

Item 2(d).  Title of Class of Securities:

            This Statement relates to the shares of common stock of the
            Issuer (the "Stock").

Item 2(e).  CUSIP Number:

            458751104

Item 3.     If this statement is filed pursuant to Sections 240.13d-1(b) or
            240.13d-2(b) or (c), check whether the person filing is a:

            (a) [ ] Broker or dealer registered under section 15 of the Act
            (15 U.S.C. 78o).

            (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C.
            78c).

            (c) [ ] Insurance company as defined in section 3(a)(19) of the
            Act (15 U.S.C. 78c).

            (d) [ ] Investment company registered under section 8 of the
            Investment Company Act of 1940 (15 U.S.C. 80a-8).

            (e) [X] An investment adviser in accordance with
            240.13d-1(b)(1)(ii)(E);


CUSIP NO. 36227K106                  SCHEDULE 13G                 PAGE 5 OF 7


            (f) [ ] An employee benefit plan or endowment fund in accordance
            with Section 240.13d-1(b)(1)(ii)(F);

            (g) [X] A parent holding company or control person in accordance
            with Section 240.13d-1(b)(1)(ii)(G);

            (h) [ ] A savings associations as defined in Section 3(b) of the
            Federal Deposit Insurance Act (12 U.S.C. 1813);

            (i) [ ] A church plan that is excluded from the definition of an
            investment company under section 3(c)(14) of the Investment
            Company Act of 1940 (15 U.S.C. 80a-3);

            (j) [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

Item 4.     Ownership.

            See Items 5-9 and 11 of the cover page for each Filer.

            Westcliff LLC, as investment manager of various client accounts,
            and Spencer, as Westcliff LLC's manager and majority owner, may
            be deemed to beneficially own the Stock owned by such accounts,
            in that they may be deemed to have the power to direct the voting
            or disposition of that Stock.  Neither the filing of this
            Schedule nor any of its contents shall be deemed to constitute an
            admission that Westcliff LLC or Spencer is, for any purpose, the
            beneficial owner of any Stock to which this Schedule relates, and
            each of Westcliff LLC and Spencer disclaims beneficial ownership
            as to that Stock, except to the extent of his or its pecuniary
            interests therein.  Neither the filing of this Schedule nor any
            of its contents shall be deemed to constitute an admission that
            any of the other individual officers and members of Westcliff LLC
            is, for any purpose, the beneficial owner of any of the Stock to
            which this Schedule relates, and such beneficial ownership is
            expressly disclaimed.

Item 5.    Ownership of Five Percent or Less of a Class.

           Not Applicable.

Item 6.    Ownership of More Than Five Percent on Behalf of Another Person.

           Westcliff LLC is the investment manager of one or more investment
           partnerships, pooled investment vehicles and/or other client
           accounts that beneficially hold the Stock and, in that capacity,
           has been granted the authority to dispose of and vote the Stock
           held by those accounts.  The client accounts have the right to
           receive (or the power to direct the receipt of) dividends received
           in connection with ownership of the Stock and the proceeds from
           the sale of the Stock.  No single client's holdings exceed five
           percent of the Stock.


CUSIP NO. 36227K106                  SCHEDULE 13G                 PAGE 6 OF 7


Item 7.    Identification and Classification of the Subsidiary Which Acquired
           the Security Being Reported on by the Parent Holding Company.

           Not applicable.

Item 8.    Identification and Classification of Members of the Group.

           Not applicable.

Item 9.    Notice of Dissolution of Group.

           Not applicable.

Item 10.   Certifications.

           By signing below, each of the signatories certifies that, to the
           best of its knowledge and belief, the securities referred to above
           were acquired and are held in the ordinary course of business and
           were not acquired and are not held for the purpose of or with the
           effect of changing or influencing the control of the issuer of the
           securities and were not acquired and are not held in connection
           with or as a participant in any transaction having that purpose or
           effect.


                                   Signatures

        After reasonable inquiry and to the best of its knowledge and belief,
each of the signatories certifies that the information set forth in this
statement is true, complete and correct.

Dated: June 29, 2007          WESTCLIFF CAPITAL MANAGEMENT, LLC


                               By: /s/ Richard S. Spencer III
                                  -------------------------------------------
                                  Richard S. Spencer III
                                  Manager


                               RICHARD S. SPENCER III


                               /s/ Richard S. Spencer III
                               ----------------------------------------------
                               Richard S. Spencer III



CUSIP NO. 36227K106                  SCHEDULE 13G                 PAGE 7 OF 7


                                    EXHIBIT A

                            JOINT FILING UNDERTAKING

        The undersigned, being authorized thereunto, hereby execute this
agreement as an exhibit to this Schedule 13G to evidence the agreement of the
below-named parties, in accordance with rules promulgated pursuant to the
Securities Exchange Act of 1934, to file this Schedule, as it may be amended,
jointly on behalf of each of such parties.

Dated:  June 29, 2007       WESTCLIFF CAPITAL MANAGEMENT, LLC


                             By: /s/ Richard S. Spencer III
                                ---------------------------------------------
                                Richard S. Spencer III,
                                Manager



                             RICHARD S. SPENCER III


                             /s/ Richard S. Spencer III
                             ------------------------------------------------
                             Richard S. Spencer III