“The questions about what to do—if anything—are fundamentally difficult,” says Dartmouth’s H. Gilbert Welch in a New York Times story about the current debate over how to treat tiny breast lesions known as D.C.I.S., or ductal carcinoma in situ.

Welch is a professor of medicine at the Geisel School of Medicine and at The Dartmouth Institute for Health Policy & Clinical Practice. He is also a professor of business administration for the Master of Health Care Delivery Science program.