Who is Sir Roderick Glossop from Life with Jeeves and what is their importance?

Sir Roderick Glossop is a well known nerve specialist (psychiatrist). He has two daughters, Honoria and Hildebrand (Tuppy), and is convinced that Bertie Wooster should be one of his patients. Glossop is also the president of the Anti-Gambling League, is an abstemious eater and drinker, and he believes that coffee is the main cause of all mental illnesses.