Currently, Dr. Hardin teaches at McMurry University in Abilene, Texas. Although he is an American, Dr. Hardin prefers to assert that his nationality is Texan, on the grounds that Texas was once an independent nation.
Hardin is considered a leading expert in the world in Texas military and social history. He is widely cited with regards to the Battle of the Alamo. Hardin has also appeared on the History Channel in "The Alamo Documentary: A True Story of Courage" He was also a historic advisor to John Lee Hancock's 2004 movie, The Alamo, starring Billy Bob Thornton.