Mark Deesing began his career in the livestock industry as a farrier and horse trainer. In 1993 he met Temple Grandin and began to work with her first in research and writing projects. They co-authored multiple books together, along with several referred journal articles on cattle behavior. Mark and Temple pioneered work on using facial hair patterns to predict temperament and fertility in cattle. Currently Mark is a custom design consultant for Grandin Livestock Handling Systems, Inc., and has designed hundreds of handling facilities for all types of livestock, as well as wildlife and zoo species.