Hanna, also known as "Jungle Jack," served as director of the Columbus Zoo and Aquarium from 1978 to 1992. He officially retired from his conservation duties late 2020. Related: Famed Zookeeper ...

Jack Hanna, who became famous for appearing on ... Hanna, 77, served as director of the Columbus Zoo from around 1978 through 1992 and was first diagnosed with Alzheimer's in 2019.

One of the largest and most popular zoos in the U.S., Ohio's renowned Columbus Zoo and Aquarium ... time home of beloved wildlife guru Jack Hanna, the zoo's director emeritus.