New York-based healthcare-focused firm Radius Ventures has promoted Justin Silver to vice president. Silver joined Radius as a senior associate in 2008. Previously, he worked as an associate with Ferghana Partners, where he specialized in life science and medical device private placements. Silver currently serves as a board observer of Ambit, Inc., Healthsense Inc., Management Health Solutions Inc., and Resolvyx Inc. Formed in 1997, Radius currently manages three funds with total committed capital of approximately $200 million.