Whittier was raised on a diversified livestock and crop farm in Northeastern Utah. He received degrees from Utah State University and the University of Nebraska. He was on faculty at the University of Missouri for 9 years. In 1995, he joined the faculty in Animal Sciences at Colorado State University where he was the State Beef Cattle Extension Specialist. During his academic career, he was actively involved in applied research of beef cow nutrition and reproductive management. Jack and colleagues developed some of the first ovulation synchronization protocols that facilitated increased use of timed artificial insemination across the beef industry. Training graduate students was a key passion for him and watching his students progress into successful careers of their own has been especially satisfying. In 2014 he was hired as Director of the Panhandle Research and Extension Center for the University of Nebraska located in Scottsbluff, NE. He retired in August 2020. Dr. Whittier and his wife, Robynn, have two grown sons, two wonderful daughters-in-law, and five ambitious grandchildren. Jack and Robynn also own a small-scale seedstock beef herd to produce SimAngus bulls and replacement heifers.