Jeff Carroll brings nearly two decades of healthcare operating experience to Sandbox Industries, including senior leadership roles where he directly structured and ran value-based care and Medicare Advantage arrangements for both payers and providers—giving him unusually hands-on experience with contracting, operations, and risk-bearing models compared with many healthcare VCs who come primarily from banking or consulting backgrounds. He also serves as Managing Director of the Blue Venture Fund, a strategic fund backed by Blue Cross Blue Shield plans, which gives him a direct window into how large insurers think about innovation and allows him to act as a bridge between early-stage companies and major payer customers.