He is the Andrew Sabin Professor of Professional Practice at Columbia Law School.
Gerrard was born in New York City, where his parents were graduate students at Columbia University, and grew up in Charleston, West Virginia.
[4] From 1979 to 2008, he was a lawyer at Arnold & Porter and served as the partner in charge of its New York City office.
[5] He was known for his environmental practice before departing the partnership to join the faculty of Columbia Law School.
[6] His specialty includes environmental law, regulation, and climate change policy.