John Y. Chang, '91

Co-Founder and CTO, Willow

John Chang is currently Chief Technical Officer and co-founder of Willow, a company which has reimagined the breast pump for nursing mothers. Previously, John co-founded and was Vice President of Research and Development of Acclarent, a company which pioneered balloon sinuplasty for the treatment of chronic sinusitis and which was acquired by Johnson & Johnson in 2010. 

John has over 25 years of experience developing medical devices and holds over 250 patents and patent applications for various medical devices in the fields of cardiology, ENT, general surgery, drug delivery, and women’s health. 

John received a B.S.E. in mechanical and aerospace engineering from Princeton University and an M.S. in mechanical engineering from Stanford University. He lives with his wife and their three children in California.