John serves as a general partner at Sevin Rosen Funds (SRF), where he focuses on imaging, computing, photonics, RF communications, and semiconductors. Before joining SRF in 1999, he cofounded and was CEO of Volumetrics Medical Imaging and was on the founding team of the digital signal processing division of Analog Devices. He holds several patents in the field of real-time volumetric ultrasound imaging. He serves on the boards of AirWavz, Ethertronics, Luxtera, and Metabolon. John is on the board of visitors of Duke University Pratt School of Engineering and on the board of Element Genomics. He earned a BSE in biomedical engineering from Duke University and an MBA from Chicago Booth.