Pam Omidyar is a scientist-turned-philanthropist who applies a hypothesis-and-test mindset to giving, founding HopeLab to use behavioral science and randomized studies for youth well-being rather than traditional grantmaking. She co-created Omidyar Network as a hybrid LLC and nonprofit structure that can fund both for-profit ventures and nonprofits from the same strategic lens, treating equity, debt, and grants as interchangeable tools for systemic change.