Sean Harper is a venture capital investor at Westlake Village Biopartners who brings an unusually deep clinical background as a trained physician-scientist from UCSF and former Executive Vice President of R&D and Chief Medical Officer at Amgen, where he personally oversaw late-stage development and regulatory interactions for multiple global drug programs. He approaches investing with an operator-first perspective, drawing on specific lessons from running large R&D organizations when advising founding teams and focusing on building companies around strong translational human biology rather than approaching opportunities primarily from a financial lens.