Dr Oz is vice chairman of Columbia’s surgery department, occasionally teaches and performs heart surgery at Columbia’s affiliated hospital.
"Dr. Oz has repeatedly shown disdain for science and for evidence-based medicine," said a letter the 10 physicians sent to a Columbia dean earlier this week. They say he's pushing "miracle" weight-loss supplements with no scientific proof that they work.
The lead author was Dr. Henry Miller, a senior research fellow at Stanford’s Hoover Institution.
In a statement on Friday, Dr Oz defended himself saying his show provides multiple points of view including his own.
Columbia University maintains Dr Oz is free to express himself as he wishes.