[name the author] man of substance abuse

It's not C.S.Lewis below so who is he, Laze and Gem? Not a drop to drink until you get it right:

'He said that he had paid his addresses to some young woman (I think a Mary E) who rejecting his offer, he took it so much in dudgeon, that he ran away from the University of London, when, in a reckless state of mind, he enlisted himself as a common man in a regiment of horse.

No objection having been taken to his height, or age, and being thus accepted, he was asked his name. He had previously determined to give one that was thoroughly Kamatschkian, but having noticed that morning over a door in Lincolns Inn Fields the name "Cumberbatch", he thought this word sufficiently outlandish, and replied "Silas Tomken Cumber-batch", and such was the entry in the regimental book ...'

Answer here.