Robert Heinlein wrote the Future History;
several of Heinlein's successors have each written a future history;
one of his successors, Poul Anderson, wrote several future histories.
Heinlein wrote one work about magic as technology;
on this theme, Anderson wrote a series that was collected, acquired a sequel and became part of a longer sequence about alternative histories.
Before Heinlein, Wells wrote about the Time Traveler and his Time Machine;
many of Wells' successors, including Heinlein and Anderson, have written individual works about time travelers and their time machines;
Anderson also wrote a series about an organization of time travelers regularly using many time machines.
illustrious precursors, Mary Shelley (see below), Wells and Heinlein;
remarkable contributions by Anderson, combining quantity with quality;
later works by Anderson breaking new ground on the theme of post-human inorganic intelligence.
In fact, Anderson's culminating work, Genesis, revisits Mary Shelley's Frankenstein theme twice:
Might human creations replace humanity?;
Would it be right to create human life?
Ironically, the post-human intelligences must ask the latter question!