Cats are one of Horitomo's two great passions in life - tattooing included. His Monmon (the Japanese term for tattooing) cats are a unique concept born out of his love for both. The artist has been tattooing for over 20 years, and is well versed in Japanese tradition including tabor (Japanese hand tattooing).

Currently based at State of Grace Tattoo in California, he has also done design work for Sega Games Systems and exhibited his work at respected institutions such as the Asian Art Museum in San Francisco.