Martin Eric Ain was a Swiss musician and producer, best known as the bassist for the influential heavy metal band Celtic Frost. Born on July 18, 1967, in Zurich, Switzerland, he played a significant role in shaping the sound of extreme metal during the 1980s and 1990s. Ain co-founded Celtic Frost in 1984, contributing to their unique blend of thrash, doom, and avant-garde elements. The band released several critically acclaimed albums, including To Mega Therion and Into the Pandemonium. Ain passed away on October 21, 2017, leaving a lasting legacy in the metal music scene.