In the book “Orphan: The Quest to Save Children with Rare Genetic Disorders,” Philip Reilly, a clinical geneticist turned venture capitalist, recounts the history of developing therapies to treat rare diseases. We spoke to Reilly, now a venture partner with Third Rock Ventures, about his own experiences in the clinic treating patients with rare diseases, how his perspective has changed as a venture investor, and what the future holds in the battle against rare diseases.

RARECast is a weekly series by Daniel S. Levine. Levine is an award-winning business journalist who has reported on the life sciences, economic development, and business policy issues throughout his 25-year career. He founded Levine Media Group in 2013, which produces The Bio Report and RARECast podcasts. Read his full bio here.