Mike Kleinhenz was an anime voice actor who did a lot of work for A.D. Vision Films. His best known roles include Maj. Andrey Kalinin on all four versions of Full Metal Panic!, Kabapu on Excel Saga, Friday Monday on Madlax, and The Raven on Princess Tutu. In addition to voice acting, Mike also had talent as a singer and guitar player.

Kleinhenz was born on November 14, 1951 in Cincinnati, Ohio. He graduated from Pasack Valley High School in Hillsdale, New Jersey in 1969. After high school, Mike went on to attend the University of Cincinnati, where he led the Bearcats' defensive line. While he was in college, Mike was chosen to play in the Ohio Shrine Bowl.

Mike graduated from the University of Cincinnati in 1974 with a B.A. degree in Radio and TV Broadcasting. However, right out of college, Mike pursued a career in sports instead of in broadcasting. Kleinhenz tried out with the San Francisco Giants, and ended up playing pre-season football for the Houston Oilers. Mike also had the opportunity to compete in the 35k racewalk at the US Olympic Festival. His interests in sports included football, basketball, baseball, fast-pitch softball, mountain biking, running, disc golf and snagging.

Mike married Sydnie Diane Meltzer in 1981, and the couple raised five sons. However, Mike and Sydnie divorced in 2003.

Mike's entertainment career has included appearances in national television and radio advertisements, as well as appearances in local advertisements in the Houston area. However, Mike is best known for his anime voice over work.

Mike's anime voice over work includes the following: Seele in the director's cut of Neon Genesis Evangelion; Lucifer and Matthias in Lady Death; Ricardo Handrick in Chrono Crusade; Goro Suzuki in Gantz; Mr. Hamilton in Kaleido Star; Shirow Watari in RahXephon; Takahashi in Parasite Dolls; Bison in Street Fighter 2 Victory: Volume VIII Fatal Confrontations; Jim Majima in Najica: Blitz Tactics; Legrand and Soldats Man in Noir; Priest in Sin: The Movie; Meth, Nozomi Takayama, and Regent in Gasaraki, Doctor in Bubblegum Crisis: Tokyo 2040; Fattman in Spriggan; Father in Slayers Return; Judge in Those Who Hunt Elves; Ishikui in Ushio & Tora; Tavern Master in Samurai Gun; Director General in Megazone 23; Yakuza Boss in Crying Freeman; and Executive B in All Purpose Cultural Cat Girl Nuku Nuku DASH!.

On July 17, 2008, it was announced by Anime News Network that Mike Kleinhenz passed away on July 11, 2008. Kleinhenz died at the age of 56 from a heart attack.