Today is the anniversary of the death in 1975 of James Blish. I still have all 12 of his Star Trek series books and Spock Must Die. They were a bright spot in my junior high school years. I also liked Cities in Flight, which is on this list of 50 Most Significant SFF Books and on The Younger Son's list of Top 15 Very Long Books that teenage readers should read, and I loved A Case of Conscience, which is on a different top-50 list.
There is a list of 16 inventions here traceable to his work.