From 2003–2011 as Secretary for Human Services, Hendrick was responsible for overseeing the Oklahoma Department of Human Services, the Oklahoma Department of Rehabilitation Services, and the Oklahoma Office of Juvenile Affairs. He also continued to serve concurrently as the Director of Human Services.
Hendrick's responsibilities from 2003 to 2011 included overseeing the Oklahoma Department of Human Services, the Oklahoma Department of Rehabilitation Services, and the Oklahoma Office of Juvenile Affairs.  He continued his role as Director of Human Services throughout this period.