Career: Carr made his TV debut as a guest on the ITV lunchtime show Today with Des and Mel. He came to true prominence on Channel 4's The Sunday Night Project with Justin Lee Collins. He makes regular guest appearances on panel shows such as 8 Out of 10 Cats and Never Mind The Buzzcocks and has featured as a panellist on Channel 4's annual Big Fat Quiz of the Year, a staple of the Christmas TV schedules. He has also fronted his own game show, Alan Carr's Celebrity Ding Dong, written his autobiography, and continues to perform stand-up. His Channel 4 show Chatty Man attracts some of the biggest names in showbiz and has been a staple of the Channel 4 schedule since 2009. He also presented a weekly programme on Radio 2 for three years, and fronted game show The Singer Takes It All. In 2016, he hosted Alan Carr's Happy Hour, which was a spin off of Chatty Man.

Career: O Briain's first post-uni job was as a children's TV presenter for RTE. He also began performing stand-up gigs on the Irish comedy circuit. He came to prominence as a team captain on the Irish topical panel show Don't Feed The Gondolas (1998-2000). He then toured heavily, performing across Europe, Asia, Australia and North America. In 2002, O Briain began making appearances on British TV shows. He has hosted the comedy panel game Mock the Week since 2005, and continues to perform stand-up. He took over from Adrian Chiles as the host of The Apprentice: You're Fired! in 2010, but quit in 2014. He has also branched out into maths and science with the series School of Hard Sums and Stargazing Live.