David has spoken for people from these groups and hundreds more:

Alabama Farmer's Association
Applications Data System
Arkansas Dairy Cooperative
Athens Furniture Industry
Auburn University
BellSouth
Central States Meat Association
Conservation League
Creative Fabrications
Dairy Farmers of America
Electric Cooperatives
Farm Bureau
Farmer's Mutual Insurance Inc.
First American Bank
Future Farmers of America
Gold Kist, Inc.
Henny Penny Corporation
Information Technology Professionals
Kentucky Boards of Education
Kentucky Pork Producers
Knoxville Executive Club
Lake Cumberland Area Development District
Land O' Lakes
Monsanto
National Association of Mutual Insurance Companies
National Coalition of Coal Mining
National Livestock Graders Association
National Highway Geology Symposium
National Management Association
Odd Fellows National Convention
Poultry Federation
Prudential Life Insurance
Philip Morris
Ruritan National Convention
Southern Cotton Ginners' Association
Sysco Food Service
Tennessee Farmers' Cooperative
Tennessee 4-H Conference
Youth Leadership
West Virginia Board of Education