KIRKPATRICK & LOCKHART LLP
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                                January 13, 2000

First Investors Series Fund
95 Wall Street
New York, New York  10005

Ladies and Gentlemen:

      You have  requested  our  opinion  as to  certain  matters  regarding  the
issuance by First Investors  Series Fund  ("Trust"),  a business trust organized
under the laws of the State of Massachusetts,  of Class A shares of common stock
(the "Shares") of the Trust pursuant to a Plan of Reorganization and Termination
("Plan") by the Trust and  Executive  Investors  Trust Blue Chip Fund  portfolio
("Executive Blue Chip Fund"). Under the Plan, the Trust would acquire the assets
of Executive Blue Chip Fund in exchange for the Shares and the assumption by the
Trust of Executive Blue Chip Fund's  liabilities.  In connection  with the Plan,
the Trust is about to file a Pre-Effective  Amendment No. 1 to its  Registration
Statement on Form N-14  ("Amendment  No. 1") for the purpose of registering  the
Shares under the Securities  Act of 1933, as amended ("1933 Act"),  to be issued
pursuant to the Plan.

      We have examined  originals or copies  believed by us to be genuine of the
Trust's  Declaration  of Trust and  By-Laws,  minutes of meetings of the Trust's
board of Trustees,  the form of Plan, and such other  documents  relating to the
authorization and issuance of the Shares as we have deemed relevant.  Based upon
that examination,  we are of the opinion that the Shares being registered by the
Amendment  No. 1 may be  issued  in  accordance  with  the Plan and the  Trust's
Declaration of Trust and By-Laws,  subject to compliance  with the 1933 Act, the
Investment Company Act of 1940, as amended, and applicable state laws regulating
the distribution of securities, and when so issued, those Shares will be legally
issued, fully paid and non-assessable.

      We note,  however,  that the Trust is an entity of the type commonly known
as a  "Massachusetts  business  trust." Under  Massachusetts  law,  shareholders
could,  under  certain   circumstances,   be  held  personally  liable  for  the
obligations  of the Trust.  The  Declaration  of Trust  states  that all persons
extending  credit to,  contracting with or having any claim against the Trust or
the Trustees  shall look only to the assets of the Trust for payment  under such
credit,  contract or claim; and neither the  Shareholders nor the Trustees,  nor
any of their agents, whether past, present or future, shall be personally liable
therefor.  It also requires that every note, bond, contract or other undertaking
issued by or on behalf of the Trust or the Trustees  relating to the Trust shall
include a recitation  limiting the obligation  represented  thereby to the Trust
and  its  assets.   The   Declaration  of  Trust  further   provides:   (1)  for
indemnification  from the  assets of the Trust for all loss and  expense  of any
shareholder held personally liable for the obligations of the Trust by virtue of
ownership of shares of the Trust; and (2) for the Trust to assume the defense of
any claim against the shareholder for any act or obligation of the Trust.  Thus,
the risk of a shareholder  incurring  financial  loss on account of  shareholder
liability  is limited  to  circumstances  in which the Trust or series  would be
unable to meet its obligations.





First Investors Series Fund
January 13, 2000
Page 2


      We hereby  consent to this opinion  accompanying  Amendment  No. 1that the
Trust  plans to file with the  Securities  and  Exchange  Commission  and to the
reference  to our firm in the  Prospectus/Proxy  Statement  filed as part of the
Amendment No. 1.

                                    Sincerely yours,

                                    KIRKPATRICK & LOCKHART LLP

                                    By:  /s/ Robert J. Zutz
                                         ------------------
                                         Robert J. Zutz