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


                                  SCHEDULE 13G


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




                           Rita Medical Systems, Inc.
                           --------------------------
                                (Name of Issuer)



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



                                    76774E103
                                    ---------
                                 (CUSIP Number)


                                January 24, 2003
                                ----------------
             (Date of Event which Requires Filing of this Statement)


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

                                [ ] Rule 13d-1(b)
                                [X] 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 on 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.  76774E103            13G           Page  2  of  6   Pages
                                                  -----  -----
-------------------------                     ----------------------------------



-- ----------------------------------------------------------------------------
   NAME OF REPORTING PERSONS
1  I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS  (Entities only)

   Michael A. Roth and Brian J. Stark, as joint filers pursuant to Rule 13D-1(k)

-- -----------------------------------------------------------------------------
2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                     (a) [ ]
                                                                         (b) [ ]
   Not Applicable.
-- -----------------------------------------------------------------------------
3  SEC USE ONLY


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

   United States of America

-- -----------------------------------------------------------------------------
----------------- ---- ---------------------------------------------------------
  NUMBER OF              SOLE VOTING POWER
    SHARES
 BENEFICIALLY
   OWNED BY         5    1,136,363
     EACH
  REPORTING
    PERSON
     WITH
                  ---- ---------------------------------------------------------
                         SHARED VOTING POWER

                    6    0
                  ---- ---------------------------------------------------------
                         SOLE DISPOSITIVE POWER

                    7    1,136,363
                  ---- ---------------------------------------------------------
                         SHARED DISPOSITIVE POWER

                    8    0
----------------------- --------- ----------------------------------------------
-- -----------------------------------------------------------------------------
9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   1,136,363
-- -----------------------------------------------------------------------------
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)

   6.6%
-- -----------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON*

   IN
-- -----------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!





SCHEDULE 13G                                              Page  3  of  6   Pages
                                                              -----  -----
                                                                February 3, 2003



Item 1(a).                 Name of Issuer.
---------                  --------------

                   Rita Medical Systems, Inc.

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

                   967 N. Shoreline Blvd.
                   Mountain View, CA  94043

Item 2(a).         Name of Person Filing.
---------          ---------------------

                   Michael A. Roth and Brian J. Stark, as joint filers

Item 2(b).         Address of Principal Business Office or, if None, Residence.
---------          -----------------------------------------------------------

                   3600 South Lake Drive
                   St. Francis, WI  53235

Item 2(c).         Citizenship.
---------          -----------

                   United States of America

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

                   Common Stock

Item 2(e).         CUSIP Number.
---------          ------------

                   76774E103

Item 3.            If this Statement is Filed  pursuant to Rule  13d-1(b),  or
------             13d-2(b) or (c), Check Whether the Person Filing is a:

                   (a) [ ] Broker or dealer  registered  under Section 15 of the
                           Exchange Act.

                   (b) [ ] Bank as defined in  Section  3(a)(6) of the  Exchange
                           Act.

                   (c) [ ] Insurance  company as defined in Section  3(a)(19) of
                           the Exchange Act.

                   (e) [ ] Investment  company registered under Section 8 of the
                           Investment Company Act.

                   (f) [ ] An  investment  advisor  in  accordance  with  Rule
                           13d-1(b)(1)(ii)(E);




SCHEDULE 13G                                              Page  4  of  6   Pages
                                                              -----  -----
                                                                February 3, 2003



                   (g)  [ ] An  employee  benefit  plan  or  endowment  fund  in
                            accordance with Rule 13d-1(b)(1)(ii)(F);

                   (h)  [ ] A  parent  holding  company  or  control  person  in
                            accordance  with  Rule  13d-1(b)(1)(ii)(G)

                   (i) [ ] A savings  association  as defined in Section 3(b) of
                           the Federal Deposit Insurance Act;

                   (j) [ ] A church plan that is excluded from the definition of
                           an  investment company  under  Section   3(c)(14)  of
                           the Investment  Company Act;

                   (k) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J)

                   If this statement is filed  pursuant to Rule 13d-1(c),  check
                   this box.                                                 [X]

Item 4. Ownership.
------  ---------

         (a)  Amount beneficially owned:
              1,136,363*
              ------------------------------------------------------------------

         (b)  Percent of class:
              6.6%*
              ------------------------------------------------------------------

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

         (i)  Sole power to vote or to direct the vote   1,136,363*  ,
                                                         ------------

         (ii) Shared power to vote or to direct the vote  0          ,
                                                         ------------

         (iii) Sole power to dispose or to direct the disposition of 1,136,363*,
                                                                     ----------

         (iv)  Shared power to dispose or direct the disposition of  0         ,
                                                                     ----------

                    *The foregoing  amounts of shares and  percentage  represent
                    the combined  indirect holdings of Michael A. Roth and Brian
                    J. Stark, as joint filers.  All of the foregoing  shares are
                    held directly by SF Capital Partners, Ltd., a British Virgin
                    Islands company ("SF Capital").  Messrs.  Roth and Stark are
                    the  founding  members  and direct the  management  of Staro
                    Asset  Management,  L.L.C.,  a Wisconsin  limited  liability
                    company  ("Staro") which (i) acts as investment  manager and
                    has  sole  power  to  direct  the   management  of  Shepherd
                    Investments  International,  Ltd., a British  Virgin Islands
                    corporation  ("SIIL"),  and (ii) acts as general partner and
                    has sole power to direct the management of Stark Investments
                    Limited   Partnership,   a  Wisconsin  limited   partnership
                    ("SILP")  which  serves  as the  general  partner  of  Stark
                    Trading, a Wisconsin general partnership ("ST"). SIIL and ST
                    are the  controlling  owners of SF Capital.  Through  Staro,
                    Messrs.  Roth and Stark possess sole voting and  dispositive
                    power  over  all  of  the  foregoing   shares.   Based  upon
                    information  provided  in the  Issuer's  Form  10Q  for  the
                    quarter  ended  September  30, 2002,  there were  15,143,708
                    shares of Common Stock issued and outstanding as of November
                    8, 2002. Therefore, for the purposes of Rule 13d-3 under the
                    Securities  Exchange Act of 1934, Messrs. Roth and Stark may
                    be deemed to be the beneficial owners of 1,136,363 shares of
                    Common Stock which  represents  6.6% of the Issuer's  issued
                    and outstanding shares of Common Stock.


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

           Not applicable.




SCHEDULE 13G                                              Page  5  of  6   Pages
                                                              -----  -----
                                                                February 3, 2003



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

            Not applicable.

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. Certification.
-------  -------------

            By signing  below I certify  that,  to the best of my knowledge  and
            belief,  the securities  referred to above 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.





SCHEDULE 13G                                              Page  6  of  6   Pages
                                                              -----  -----
                                                                February 3, 2003

                                    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.


                                                     February 3, 2003



                                                      /s/ Michael A. Roth
                                                     ---------------------------
                                                     Michael A. Roth


                                                      /s/ Brian J. Stark
                                                     ---------------------------
                                                     Brian J. Stark





                                    EXHIBIT 1

                          AGREEMENT AS TO JOINT FILING

                            Dated: Februaury 3, 2003

         The undersigned hereby agree that the Schedule 13G with respect to Rita
Medical Systems, Inc. dated as of the date hereof, is filed on behalf of each of
the undersigned jointly pursuant to Rule 13d-1(k).



                                                      /s/ Michael A. Roth
                                                     ---------------------------
                                                     Michael A. Roth



                                                      /s/ Brian J. Stark
                                                     ---------------------------
                                                     Brian J. Stark