late 1800’s – mid 1950’s
Robert A. Heinlein (July 7, 1907 - May 8, 1988), is universally recognized as a Grand Master and a Founding Father of American Science Fiction.
Heinlein began his career writing for the emerging SF pulp fiction magazines of the late 1939 when pulp magazines offered writing contests to attract new writers. Heinlein responded to such an ad and wrote his Life Line which was published by Astounding Science Fiction magazine.
Over the next fours years, until his military service in WWII, Mr. Heinlein would write over thirty short stories and three novels for the pulps. He quickly became one of the most popular writers for Astounding earning the highest rates in the business. During this time many of his stories are loosely associated in what is his Future History.
Between 1947 and 1958, Heinlein wrote twelve bestselling science fiction stories for the Juvenile/Young Adult market.
During the 1960's, Heinlein transitioned to the Adult SF category and wrote a number of classics including four Hugo award-winning novels.
Heinlein’s knack for offending sensibilities is one of his calling cards for instance, when his protagonists have affairs with their own clones, or go back in time to court their mom under the watchful eye of grandpa. His zeal for controversy not only set him apart from the other sci-fi masters of his era but also keeps us arguing about his books long after his passing. His pen names were: Anson MacDonald, Lyle Monro, John Riverside, Caleb Saunders, Simon York.
For more on Heinlein check here: https://en.wikipedia.org/wiki/Robert_A._Heinlein
H is also for HILARIOUS, I mean, c'mon! Ya gotta laugh at this one, no?