Glen Baxter is well known for his surrealistic and absurdly-captioned cartoons, often drawn in a style which harks back to illustrated children's books from the 1930s. (Page 4.)
Ronald Searle (1920-2011) was one of the world's most distinguished - and distinctive - illustrators. I know him best for his Molesworth and St Trinian's books, first published in the 1950s, but these represent only a tiny part of his illustrative work. (Page 30.)
Sidney Harris is the world's leading 'scientific' cartoonist. I like best the ones involving mathematicians at the blackboard, and there are four good examples on pages 24, 59, 109 and 127.
Carl Giles (1916-1995) was the Daily Express cartoonist for more years than I can remember. He is best known for his suburban 'family', including the redoubtable 'Grandma', but the four cartoons I use in my book have a slightly different flavour. (Pages 29, 113, 139, 166.)
Mel Calman (1931-1994) was a master exponent of the 'pocket' cartoon. These usually featured a sparsely-drawn 'little man' character, who can be seen, looking rather worried as usual, on page 135.