Terri Irwin Biography Age Family - Terri Irwin Is a Well-Known Personality in the Wildlife Conservation World, Known for Her Work as a Naturalist, Conservationist, and Author. She Is Best Known for Her Marriage to the Late Steve Irwin, a Famous Australian Zookeeper and Television Personality. Terri Has Continued Their Conservation Work Since Steve's Passing, and She Has Become a Respected Figure in Her Own Right. Let's Take a Closer Look at the Life and Family of Terri Irwin.