The rest of the 100 (in alphabetical order): Tara Butler, managing director, Ascension Health Ventures

An integral part of Ascension Health Ventures, the investment arm of healthcare system Ascension Health, since 2002, Tara Butler was promoted to become managing director in 2013.

After studying medicine at Pennsylvania University, Butler moved on to a residency in obstetrics and gynaecology at Washington University in St Louis before starting at Ascension, where she uses her medical background to focus on investments in the medical device and diagnostics sectors.

She has worked on a number of deals at the unit as an investor, serving on a portfolio firm’s board and providing oversight. She worked on medical device manufacturer Apama Medical’s 2015 series B, where Ascension provided $11m as the first tranche of a $17.5m round. Butler joined fellow corporate venturing unit Baxter Ventures in backing glaucoma therapeutics firm Ocular Therapeutix in 2013, which went on to go public a year later. She also backed another glaucoma-focused startup Ivantis in a $27m series B in 2013.