As in the previous post, I often list sf writers from Wells and Stapledon although, of course, sf began with Mary Shelley (see image) and several of Poul Anderson's literary antecedents were much earlier: the Bible; the Eddas and sagas; Shakespeare. Post-Shelleyan antecedents were Mark Twain and Rudyard Kipling. Post-Wellsian antecedents were L Sprague de Camp, John W Campbell, Robert Heinlein and Isaac Asimov. (I mention Asimov not because of any qualitative comparison but because Anderson's first future history has both a robot and a science of society while his second future history has the fall of an interstellar empire.)
These are powerful literary traditions. This blog celebrates Poul Anderson as Wellsian sf writer, successor of Stapledon and Heinlein, saga re-teller and myth-maker. More recently, the blog has also focused on SM Stirling as one worthy successor of Anderson. However, here is a question for blog readers. Which other contemporary sf writers not discussed here also make significant contributions to these traditions?