Jack Hanna built the Columbus Zoo and Aquarium into one of the nation's best. He then captivated national audiences on David Letterman's late-night talk show, "Good Morning America" and a number of his own Emmy-winning animal series that still run in syndication.

It was announced in 2021 that Hanna was retiring from public life. “Doctors have diagnosed our dad, Jack Hanna, with dementia, now believed to be Alzheimer's disease,” Hanna's family wrote in a statement posted to his verified Twitter account at the time.

Hanna retired from public life in 2021. He now spends his time at home with his wife Suzy in Bigfork, Montana.

76 years (January 2, 1947)Jack Hanna / Age The 76-year-old had a long career as media personality, appearing as an animal expert on talk shows and hosting his own syndicated shows like "Jack Hanna's Animal Adventures."

Jack Hanna built the Columbus Zoo and Aquarium into one of the nation's best. He then captivated national audiences on David Letterman's late-night talk show, "Good Morning America" and a number of his own Emmy-winning animal series that still run in syndication.

Hanna was raised on a farm in Tennessee and showed an early interest in pursuing a career with animals, volunteering to work for his family's veterinarian at the age of 11. After he earned (1969) a bachelor's degree from Muskingum College, New Concord, Ohio, Hanna and his wife opened a pet shop in Knoxville.

the Columbus Zoo and Aquarium Jack Bushnell Hanna (born January 2, 1947) is a retired American zookeeper and a former director emeritus of the Columbus Zoo and Aquarium.

He doesn't hunt, but supports those who do. The world was set up with a balance of predator and prey, and “without the good hunter, this world would be a disaster,” Hanna said.

“Jungle” Jack Hanna and his animals became a staple on late-night and daytime TV, thanks to his many appearances on shows like “The Tonight Show Starring Johnny Carson,” “Late night with David Letterman” and “Today.”

The 76-year-old had a long career as media personality, appearing as an animal expert on talk shows and hosting his own syndicated shows like "Jack Hanna's Animal Adventures."

Before the onset of his disease, Hanna was well-known for animal demonstrations on talk shows hosted by Johnny Carson, David Letterman, and James Corden, He also hosted the syndicated TV show “Jack Hanna's Animal Adventures” from 1993 to 2008, “Jack Hanna's Into the Wild,” which started in 2007, and “Jack Hanna's Wild ...

Stephen Robert Irwin (22 February 1962 – 4 September 2006), known as "The Crocodile Hunter", was an Australian zookeeper, conservationist, television personality, wildlife educator, and environmentalist.

Robinson Devor Zoo (2007 film)