John Sessions performed on the early episodes of the British edition of Whose Line.
A talented, if somewhat smug, performer, John was the first major focus of the show (a role later held by people such as Tony Slattery and Ryan Stiles). He was particularly strong when required to show his knowledge of literature and theatre, frequently adopting the styles of classic authors in Authors and performing uncannily authentic impressions in Film and Theatre Styles (at one point being asked what he was doing as Noel Coward, responding "I'm a 1920s old whoopsie and I can do what I want").
Many fans of the show tend to criticize John's appearances as he had a tendency to monopolize scenes and appear too high-brow. In his defense, the early episodes of the show were unclear about what level of audience they were playing to anyway.
John's appearances (UK)
Series 1: Every episode (including pilot) - 13 in total
Series 2: Episodes 2, 3, 5, 6, 9, 12, 13, 16 and 17
Series 3: Episodes 11 and 14