Sociologists in fiction

On holiday I read Eric Ambler's Send No More Roses, a psychological thriller which I can heartily recommend. Written in the 1970s, it's quite different from his classic interwar adventures which usually feature a little man who stumbles into international political intrigues that put him in imminent danger. I won't give you any plot spoilers except to say that three of the main characters are sociologists (broadly speaking). That set me wondering how many other novels I could think of that feature sociologists. Alison Lurie's Imaginary Friends is one, the grotesque Howard Kirk in The History Man is another.  The principal character in Frank Parkin's Krippendorfs Tribe is a social anthropologist (I'm broad minded). There must be a sociologist somewhere in David Lodge's university novels but  I'm too lazy to check. Can you think of any others?