Who hosted the original U.S. version of 'Who Wants to Be a Millionaire'?

Who succeeded Bob Barker as host of 'The Price Is Right'? Which game show was hosted by Monty Hall? Which game show asks contestants to guess the most popular survey answers? Which game show gives contestants answers and requires them to respond in the form of a question? Which contestant holds the record for the longest winning streak on 'Jeopardy!', with 74 wins? Which reality competition show featured Simon Cowell, Paula Abdul, and Randy Jackson as original judges? Who won the first season of 'American Idol' in 2002? Which 'American Idol' winner became a country music superstar after winning Season 4?