Fontana was one of the driving creative forces behind the original Star Trek in the 1960s and was the show-runner of the animated spinoff in the 1970s. She was responsible for a lot of the character development of Spock, notably in “This Side of Paradise,” “Journey to Babel,” and “Yesteryear.” She’s probably the only person to write for four different Trek TV shows (original, animated, The Next Generation, and Deep Space Nine), and in a just world, she’d be considered the co-creator of TNG.
She continued to write for Trek tie-ins, including prose, comics, and role-playing game material, and for fan films, and her influence on the franchise can still be seen in the use of Spock, Sarek, and Amanda Grayson in Star Trek Discovery, which used her work as a springboard for how those characters, as well as that of Michael Burnham, were developed.
I confess to not always being the biggest fan of her writing, but that doesn’t change that she was a great person, a great writer, and a huge and influential part of the most popular science fiction story of the past five decades.
Rest in peace, great lady.