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

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3 )*

                            GP Strategies Corporation
            ---------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
            ---------------------------------------------------------
                         (Title of Class of Securities)

                                    36225V104
            ---------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 2002
            ---------------------------------------------------------
             (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).


                                Page 1 of 9 pages

CUSIP No. 36225V104                     13G                    Page 2 of 9 Pages

--------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            Liberty Wanger Asset Management, L.P.  36-3820584

--------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

            Not Applicable                                               (a) [ ]
                                                                         (b) [ ]
--------------------------------------------------------------------------------
  3     SEC USE ONLY

--------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

            Delaware

--------------------------------------------------------------------------------
                       5    SOLE VOTING POWER
     NUMBER OF              None
       SHARES
                       ---------------------------------------------------------
    BENEFICIALLY       6    SHARED VOTING POWER
      OWNED BY              870,000
        EACH
                       ---------------------------------------------------------
     REPORTING         7    SOLE DISPOSITIVE POWER
    PERSON WITH             None
                       ---------------------------------------------------------
                       8    SHARED DISPOSITIVE POWER
                            870,000
--------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            870,000

--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           Not Applicable                                   [ ]

--------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.7%

--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

           IA
--------------------------------------------------------------------------------

CUSIP No. 36225V104                     13G                    Page 3 of 9 Pages


--------------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            WAM Acquisition GP, Inc.

--------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

            Not Applicable                                               (a)[ ]

                                                                         (b)[ ]
--------------------------------------------------------------------------------
  3     SEC USE ONLY

--------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

            Delaware

--------------------------------------------------------------------------------
                       5    SOLE VOTING POWER
     NUMBER OF              None
       SHARES
                       ---------------------------------------------------------
    BENEFICIALLY       6    SHARED VOTING POWER
      OWNED BY              870,000
        EACH
                       ---------------------------------------------------------
     REPORTING         7    SOLE DISPOSITIVE POWER
    PERSON WITH             None

                       ---------------------------------------------------------
                       8    SHARED DISPOSITIVE POWER
                            870,000

--------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            870,000

--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

           Not Applicable                         [ ]

--------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           5.7%

--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

           CO
--------------------------------------------------------------------------------

Item 1(a)                  Name of Issuer:

                                    GP Strategies Corporation

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

                                    9 West 57th Street
                                    New York, NY 10019

Item 2(a)                  Name of Person Filing:

                                    Liberty Wanger Asset Management, L.P.
                                    ("WAM") and WAM Acquisition GP, Inc., the
                                    general partner of WAM ("WAM GP")


Item 2(b)                  Address of Principal Business Office:

                                    WAM and WAM GP are both located at:

                                    227 West Monroe Street, Suite 3000
                                    Chicago, Illinois  60606


Item 2(c)                  Citizenship:

                                    WAM is a Delaware limited partnership and
                                    WAM GP is a Delaware corporation.

Item 2(d)                  Title of Class of Securities:

                                    Common Stock

Item 2(e)                  CUSIP Number:

                                    36225V104

Item 3                     Type of Person:

                                    (e)     WAM is an Investment Adviser
                                            registered under section 203 of the
                                            Investment Advisers Act of 1940; WAM
                                            GP is the General Partner of the
                                            Investment Adviser.


                                Page 4 of 9 pages

Item 4                     Ownership (at December 31, 2002):

                                    (a)     Amount owned "beneficially" within
                                            the meaning of rule 13d-3:

                                            870,000

                                    (b)     Percent of class:

                                            5.7 % (based on 15,280,731 shares
                                            outstanding as of November 11,
                                            2002).

                                    (c)     Number of shares as to which such
                                            person has:

                                            (i)     sole power to vote or to
                                                    direct the vote: none

                                            (ii)     shared power to vote or to
                                                     direct the vote: 870,000

                                            (iii)    sole power to dispose or to
                                                     direct the disposition of:
                                                     none

                                            (iv)     shared power to dispose or
                                                     to direct disposition of:
                                                     870,000

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:

                                    The shares reported herein have been
                                    acquired on behalf of discretionary clients
                                    of WAM. Persons other than WAM and WAM GP
                                    are entitled to receive all dividends from,
                                    and proceeds from the sale of, those shares.

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


                                Page 5 of 9 Pages

Item 10                    Certification:

                                    By signing below I certify that, to the best
                           of my 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.


                                Page 6 of 9 Pages

                                    Signature

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date:  February 4, 2003


                           The undersigned corporation, on the date above
                           written, agrees and consents to the joint filing on
                           its behalf of this Schedule 13G in connection with
                           its beneficial ownership of the security reported
                           herein.

                                   WAM Acquisition GP, Inc.
                                       for itself and as general partner of
                                       LIBERTY WANGER ASSET MANAGEMENT, L.P.



                                   By:  /s/ Bruce H. Lauer
                                        ----------------------------------------
                                            Bruce H. Lauer
                                            Senior Vice President and Secretary


                                Page 7 of 9 Pages

                                  Exhibit Index

Exhibit 1                  Joint Filing Agreement dated as of February 4, 2003
                           by and between Liberty Wanger Asset Management, L.P.
                           and WAM Acquisition GP, Inc.


                                Page 8 of 9 Pages