Robert Windham, a.k.a. Blackjack Mulligan, is the patriarch of the Windham family.

After training in his native state of Texas, Mulligan made waves in National Wrestling Alliance, winning multiple singles championships in its territories, including the NWA United States Championship on three separate occasions.

He also won several tag team championships with his partner, Blackjack Lanza.

As a peformer, Blackjack was known for his submission move, the Clawhold. He also liked to finish off his opponents with the Lariat, a move that would later be adopted by his sons, Barry and Kendall, and by fellow Texan John Bradshaw Layfield, formerly of the New Blackjacks.