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Esteban Masuda has been with Rigel Pharmaceuticals Inc. since March 1998, holding various positions such as Executive Vice President & Head of Research, Senior Vice President & Head of Research, Senior Vice President of Immunology, and Vice President of Immunology. Prior to this, Masuda worked at DNAX Research Institute from January 1991 to February 1998 as a Senior Research Associate and Postdoctoral Fellow. Masuda holds a PhD in Biological Sciences from Hiroshima University, along with a BS in Biochemistry from the University of California, Riverside, and an AS in Biological Sciences from Santa Ana College.