Daniel P. O'Day occupies the position of Chairman & Chief Executive Officer at Gilead Sciences, Inc.

He is also on the board of Galapagos NV, Pharmaceutical Manufacturers Association of America, Flatiron Health, Inc. and Shanghai Roche Pharmaceuticals Ltd.

In his past career he held the position of CEO-Roche Pharmaceuticals at Roche Holding AG Chief Executive Officer of Roche Pharmaceuticals, Inc. President & Chief Executive Officer at Roche Molecular Systems, Inc. Chief Operating Officer for Roche Diagnostics An and Head-Business Unit, Arthritis & Respiratory at Roche Pharma Schweiz AG (which are all subsidiaries of Roche Holding AG), Head-Corporate Planning at Roche Diagnostics KK and General Manager for Roche A.

He received an undergraduate degree from Georgetown University and an MBA from Columbia University.