For you first, my go-to is Seaman McGuire (fantasy)/Mira Grant (horror). These are the same person. I probably have others from this category on my shelves but I haven’t really been paying attention. She’s good for having representation in a lot of her books, though.
Canadian, pick your poison: Guy Gabriel Kay; Pierre Berton (non-fiction, mostly, but if you have kids, The Secret World of Og is fantastic); Cory Doctorow was one of ours, once; Howard Engel (had a stroke, lost the ability to read. Kept writing.); Margaret Atwood; Yann Martel; William Gibson, of course; Vincent Lam; if you have small children, definitely Robert Munsch… it’s a long list.