EXHIBIT 31.1

                            SECTION 302 CERTIFICATION

I,  R.  Bruce  Stewart,  certify  that:

     1.     I  have  reviewed  this Quarterly Report on Form 10-QSB of Arrowhead
Research  Corporation;

     2.     Based  on  my  knowledge, this Quarterly Report does not contain any
untrue  statement  of a material fact or omit to state a material fact necessary
to  make  the  statements  made,  in light of the circumstances under which such
statements  were made, not misleading with respect to the period covered by this
Quarterly  Report;

     3.     Based on my knowledge, the financial statements, and other financial
information  included  in  this Quarterly Report, fairly present in all material
respects  the  financial  condition, results of operations and cash flows of the
registrant  as  of,  and  for,  the  periods presented in this Quarterly Report;

     4.     The registrant's other certifying officers and I are responsible for
establishing  and  maintaining disclosure controls and procedures (as defined in
Exchange  Act  Rules  13a-15(e)  and 15d-15(e)), for the registrant and we have:

        (a)  designed  such  disclosure  controls and procedures, or caused such
disclosure  controls  and  procedures  to  be designed under our supervision, to
ensure  that  material  information  relating  to  the registrant, including its
consolidated  subsidiaries, is made known to us by others within those entities,
particularly during the period in which this Quarterly Report is being prepared;

        (b)  evaluated the effectiveness of the registrant's disclosure controls
and  procedures and presented in this Quarterly Report our conclusions about the
effectiveness  of  the  disclosure  controls and procedures as of the end of the
period  covered  by  this  report  based  on  such  evaluation;  and

        (c)  disclosed  in  this Quarterly Report any change in the registrant's
internal  control over financial reporting that occurred during the registrant's
most  recent  fiscal quarter (the registrant's fourth fiscal quarter in the case
of  an  annual  report) that has materially affected, or is reasonably likely to
materially  affect,  the registrant's internal control over financial reporting;
and

     5.     The  registrant's  other  certifying  officers and I have disclosed,
based  on  our  most  recent  evaluation  of  internal  control  over  financial
reporting,  to the registrant's auditors and the audit committee of registrant's
board  of  directors  (or  persons  performing  the  equivalent  functions):

        (a)  all significant deficiencies in the design or operation of internal
controls  over  financial  reporting  which  are  reasonably likely to adversely
affect  the  registrant's  ability  to  record,  process,  summarize  and report
financial  information;  and

        (b)  any  fraud,  whether  or  not material, that involves management or
other employees who have a significant role in the registrant's internal control
over  financial  reporting.


Date: February 13, 2004
                                    /s/ R. BRUCE STEWART
                                    ----------------------
                                    R. Bruce Stewart