William B. is currently a Strategy Partner at Andreessen Horowitz, where they focus on finance and strategic planning. Previously, they held leadership roles at PayPal as a Finance Manager, managing the FP&A for various financial services, and at Venmo as a Senior Finance Manager, overseeing over $1B in revenue. William has also served as the Director of Finance and Business Operations at Piper, Inc., contributing to its significant growth and successful acquisition. Their experience includes co-founding Allume Energy, specializing in innovative solar power solutions, as well as working with the United Nations on energy and natural resources law.