EX-99.1 3 y83009exv99w1.txt JOINT FILING AGREEMENT SCHEDULE 13G CUSIP NO. 232808105 PAGE 14 OF 15 PAGES Exhibit I JOINT FILING AGREEMENT This will confirm the agreement by and among the undersigned that the amendment to Schedule 13G filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Common Stock, no par value, of Questcor Pharmaceuticals, Inc., a California corporation, is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. Dated as of January 28, 2003 /s/ Arthur G. Altschul, Jr. ------------------------------- Arthur G. Altschul, Jr. /s/ Reinaldo M. Diaz ------------------------------- Reinaldo M. Diaz DELTA OPPORTUNITY FUND, LTD. By: DIAZ & ALTSCHUL ADVISORS, LLC, as Investment Advisor By: /s/ Christopher S. Mooney ---------------------------- Christopher S. Mooney Title: Chief Financial Officer DELTA OPPORTUNITY FUND (INSTITUTIONAL), LLC By: DIAZ & ALTSCHUL MANAGEMENT, LLC, as Managing Member By: /s/ Christopher S. Mooney ---------------------------- Christopher S. Mooney Title: Chief Financial Officer SCHEDULE 13G CUSIP NO. 232808105 PAGE 15 OF 15 PAGES DIAZ & ALTSCHUL ADVISORS, LLC By: /s/ Christopher S. Mooney --------------------------------- Christopher S. Mooney Title: Chief Financial Officer DIAZ & ALTSCHUL MANAGEMENT, LLC By: /s/ Christopher S. Mooney --------------------------------- Christopher S. Mooney Title: Chief Financial Officer