Wikipedia says that Georgette Heyer is the pen name of Georgette Heyer. And she also wrote as Stella Martin. I remember reading a couple of her mysteries also. As I glance through the Heyer citations I see that a major source of information is Jane Aiken Hodge, another writer I read a lot of (this is during my teens and twenties, when the writers had been prolific for a while and I could get my hands on their books at the library or in my mother's bookshelves.)