Professor Gordon Wall has made highly significant and original contributions to the development of Algebra, in particular to the Theory of Groups. His early work on projective groups over finite fields, published jointly with Richard Brauer and Michio Suzuki (though first arrived at independently), has been pivotal in the recent spectacular advances of finite group theory. Since then he has made surprising counter-examples to a conjecture of Szekeres, that had baffled many leading researchers, and he has many more deep results to his credit. He has always instinctingly given of his ideas to his collaborators and younger colleagues.