1. Purdue University; Supervisory Plant Pathologist and Oilseed Research Leader, SEA-USDA, 1961-1977; Georgia, South Carolina Area, SEA-USDA; Tifton Georgia
2. Research Station, Agriculture Canada, Morden, Manitoba; sunflower pathologist since 1961; author or coauthor of more than 50 scientific and general publications on plant diseases.