Doximity, Inc. announced entrepreneur and LinkedIn co-founder Konstantin Guericke has joined its board of directors. Mr. Guericke brings a wealth of knowledge in growing early-stage companies to become sustainable businesses. He will utilize his experience growing and managing LinkedIn's professional user base to guide Doximity's social platform that allows physicians to collaborate, share secure messages, and grow referral networks. Mr. Guericke previously served as CEO of jaxtr, a social communications startup with over 10 million members, and led LinkedIn's marketing as vice president from pre-product phase to six million members and profitability.