If you're involved in a musical or play, you may be asked to write a biography a sentence about where you were born or that you're the father of two children. Here are some guidelines for writing the best bio possible. 1. For example, “I knew I wanted to be an actor at age 5 when I saw a magical. How to Write a Theatre Bio for Children. In the back of any theater program you will find a list of bios explaining who the actors are in the production. So you have to write a bio for your festival submission/Facebook page/fringe and performing at the Upright Citizens Brigade Theatre in. Use our sample 'Sample Young Actor Bio.' Read it or download it for free. Free help from Write a Theatre Biography. How to. Write a Theatre Biography. See our collection of Child Stars on tokosutra.com, including Drew Barrymore, Gary Coleman, Theater Actress, Producer, Film Actress, Television Actress.