Robert Anthony Stoops (born September 9, 1960) is a former American college football coach. He is the former head football coach at the University of Oklahoma, a position he held from 1999 until he announced his retirement June 7, 2017. During the 2000 season, Stoops led the Sooners to an Orange Bowl victory and a national championship.

Based on the paragraph above can we conclude that "Stoops was also an assistant coach at Oklahoma."?
It's impossible to say