Emmy-nominated animator Mark Glamack passed away on May 29 at a hospital in Baldwin Park, California. He was 73, according to Hollywood Reporter.

Glamack’s cause of death was complications from the herbicide Agent Orange used during the Vietnam War. He became exposed to Agent Orange while he worked as a medic for the U.S. Army.

His life began in Rochester, New York in 1947. Early on in his animation career, he worked at Walt Disney Studios. His first projects there were The Jungle Book, Bedknobs and Broomsticks, The Wonderful World of Disney and EPCOT. Glamack also spent time at Hanna-Barbera, Filmation, Film Roman, HBO and MGM, via Hollywood Reporter.

Other notable projects of Glamack’s include He-Man and the Masters of the Universe, All Dogs Go to Heaven and Life with Louie.

Glamack did not limit himself to animation; he also worked as a writer, producer and director in the industry. With his experience, he helped create characters like She-Ra from the show She-Ra: Princess of Power, Oliver from Oliver Twist, Yogi Bear from The Yogi Bear Show, Scooby-Doo from The Scooby-Doo Show, Hulk from The Incredible Hulk, Sonic from Sonic the Hedgehog, both the cat and mouse from Tom & Jerry, Dyno-Mutt from Dyno-Mutt, Dog Wonder, characters from The Flintstones and G.I. Joe, via Hollywood Reporter.

Glamack’s Emmy nomination came in 1999 for his work on the Fox Kids program Life with Louie, which was based on stand-up comedian Louie Anderson’s life as he grew up in Wisconsin. Other voice actors in the series included Debi Derryberry (F is For Family), Justin Shenkarow (Hey Arnold!) and Edie McClurg (Wreck-It Ralph).

Beyond his work in the animation field, Glamack also held the governor position for six terms at the Academy of Television Arts and Sciences. He oversaw animation and worked on budget, awards, activities and membership committees. He completed his last term with ATAS in 2002, via Hollywood Reporter.

His last known work was the writing, illustrating and publishing of the family-oriented novel The Littluns and the Book of Darkness in 2009. The book won a Dove Award, which is given to top projects involving Christianity and gospel messages.

Glamack never married and had no children, via Hollywood Reporter.