Tachyon Publications is a long-time San Francisco science fiction and fantasy book publishing company. I designed and illustrated a lot of their book jackets when they were just starting out, and I also designed their logo for publisher Jacob Weisman, who wnated a memorable mascot for his book line. They’ve now been using this logo for the company for over 25 years!
On Tachyon's 20th anniversary, they celebrated with a big cake based on the logo: