Brennan has spent 10 years leading engineering teams in NYC in Healthcare and Ecommerce. Most recently, he was a founding team member of Cityblock Health where he led the engineering team through standing up patient-facing telehealth experiences, deep data partnerships with payors and led the development of Cityblock’s internal care management software.

Prior to Cityblock, he helped found numerous startups such as Care/of, led engineering at Motivate, ran Artsy’s public facing art discovery product and launched their art auctions software.