Answer: Robin Williams
Williams, born on July 21st, 1951 in Chicago, Illinois, was cast as Daniel Hillard/Mrs. Doubtfire. Daniel did voice impersonations for TV shows but he quit his job and it was on the day he quit that his wife, Miranda, decided to divorce him after he threw a birthday party for their son, Chris, that violated city laws. During the custody hearing, the judge granted full custody to Miranda Hillard and gave Daniel supervised visitation every weekend. Daniel saw an ad from Miranda in the paper about how she needed a housekeeper to watch the kids when they came home from school. Daniel impersonated a woman when he spoke to Miranda over the phone about the ad and told her his name was Mrs. Doubtfire (he saw the words "doubt' and "fire" in the newspaper). Miranda set up an interview for Mrs. Doubtfire and it was not until a few days later that Daniel went to interview for the job. Daniel went to his brother and asked him to make him look like a woman. His brother provided the mask, the clothes and a brand new set of false teeth for Daniel to become Mrs. Doubtfire. At the end of the movie, Miranda found out that Daniel was Mrs. Doubtfire and told him off for lying to her. The court, again, gave full custody to Miranda and allowed Daniel to see his kids every weekend with supervised visits. Miranda consulted with Daniel about a better schedule for the children and they agreed that Daniel would take the kids to school every day and they would go to his house after school until Miranda picked them up. Williams starred in the films "Hook", "Patch Adams" and "Jack". In 1998, Williams received an Academy Award for Best Supporting Actor for his role in the film "Good Will Hunting". Other Oscar nominees for Best Supporting Actor that year were Anthony Hopkins for "Amistad", Greg Kinnear for "As Good As it Gets", Burt Reynolds for "Boogie Nights" and Robert Forster for "Jackie Brown".