Who is the English impressionist and comedian that Billy Marsh represents?
Billy Marsh:  Widely known as the “doyen of theatrical agents”, he was the founder and namesake of Billy Marsh Associates, a renowned entertainment agency, in recent times representing the likes of Jon Culshaw, Esther Rantzen and Fiona Phillips. Jon Culshaw: Jonathan Peter "Jon" Culshaw (born 2 June 1968) is an English impressionist and comedian, best known for his work on the radio comedy "Dead Ringers" since 2000.
Jon Culshaw