Without question, my favorite science fantasy writer, for the Dragonrider novels of Pern. Her Crystal Singer series was also a favorite and the FT & T novels are worth a mention. Methodical, logical but with the ability to carry a reader away completely, her talent was prodigious. Her son, first in collaboration, later as a solo author has added to her Pern novels...and I'm very happy about that. But her genius and ability will be missed but remembered for many years to come.