John Jason "Blackjack" Harriman I was a human Starfleet officer who held the rank of Admiral by the late 2280s. For several years (including 2289 and 2290) he served as the Commander-in-Chief of Starfleet. He had one daughter, Lynn Harriman, and one son, John Jason Harriman II, best known for his tenure as captain of the USS Enterprise-B. Physically speaking, he resembled his son, but had a broader and more rugged appearance. (TOS novel: Excelsior: Forged in Fire, TLE novel: One Constant Star)