He is president of Rion, Rion & Rion, L.P.A., Inc., a three-generation criminal defense firm founded in 1938 by his grandfather. Jon Paul has tried cases in 27 states and hundreds of felony trials, including death penalty cases. His work garners his law firm of seven attorneys a national reputation. He is a lifetime member of the National Association of Criminal Defense Lawyers who is board certified in the field of criminal law and a fellow of the American Board of Criminal Defense Lawyers.