Given the question: Facts:   - profession: surgeon    - known for: heart valve surgery valve repair and replacement surgery minimally invasive heart    - work institutions: brigham and women 's hospital harvard medical school      - name: dr. lawrence h. cohn    - image: dr.cohn.jpg    - specialism: cardiovascular surgery    - birth place: san francisco , california   Based on these bullet points, write a short biography describing the life of lawrence h. cohn .
The answer is:
lawrence h. cohn , md , is an american-born pioneering cardiac surgeon , researcher , and medical educator .he has been on the surgical staff at harvard medical school since 1971 and has been a professor of surgery at harvard medical school since 1980 .in 2000 , he was awarded the first endowed chair in cardiac surgery at harvard medical school .