Son of Donald Wesley and Hazel Laura (Rooney) Clark. He was confirmed in the Catholic Faith at Sacred Heart Church, in Murdock, MN. He grew up on the rural family farm in Kerkhoven Township. He graduated in 1972 from Kerkhoven High School. While active in the local 4-H club and FFA chapter, he was involved in livestock judging. His specialties were horse and cattle judging. He earned an Associates Degree in Science at Willmar Community College, and graduated in 1977 from the University of Minnesota with a bachelor's degree in Animal Science. While attending the University of Minnesota, he was a member of the Alpha Gamma Rho Fraternity, Animal Science Club, and Livestock Judging Focus Group. After graduation, he worked for the Upjohn Pharmaceuticals-Veterinarian Division near Iowa City, IA. In the mid-1980's, he worked in the agricultural realty industry before starting his own environmental land applications business. Later on, he started an independent farming operation which included cattle and horses in Northeast Iowa. While operating Clark Farms, he founded Clark Angus Genetics and CNN Quarter Horses. In 2013, he purchased a ranch in rural Ben Wheeler, TX and named it White Pines Farms. Casey was a lifetime member of the American Angus Association and American Quarter Horse Association. He attended many stock shows in Denver, CO. He participated in multiple cattle disbursement sales throughout the south and midwest, and explored land and cattle opportunities in Costa Rica. He was a member of the St Edward Catholic Church in Athens, TX, serving as a Saturday evening mass usher. He was preceded in death by his father, Donald Wesley Clark. Surviving are his mother, Hazel Clark of Willmar, MN; siblings, Keith (Bit) Clark of Olathe, KS, Kim Clark of Murdock, Kaye (Thomas) Dooley of Spicer, Kyle (Jackie) Clark of Murdock, Kris Clark of Glenwood, and Kirsten (Kyle) Kopacek of Lake Park.