He explained that he found antetonitrus when he came to Wits in 2001 while a post-doctoral research assistant at Bristol University in Britain .
He explained that he found Antetonitrus when he came to Wits in 2001 as a post-doctoral research assistant at England 's University of Bristol .
Tornadoes tore through Kansas , Missouri and other states in the Midwest , killing as many as 29 people , the Associated Press reported .