PEOPLE: National Corn Growers CEO to retire after long stint in agriculture Amanda Peterka, E&E reporter Published: Thursday, March 13, 2014 The National Corn Growers Association announced the retirement today of CEO Rick Tolman after 37 years in agribusiness. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.