- Henn has been an animator for Disney studios for 35+ years. He was mentored by Disney Legend and one pf the Nine Old Men, Eric Larson.
- He has been nominated for an Annie award four times: three times for Character Animation for The Lion King, Mulan, and Winnie the Pooh, and once for Short Animated Film Direction for John Henry.
- He has animated many of Disney’s best-known characters (from Goofy to Winnie the Pooh to the mice in The Rescuers), he has the reputation as the animator of heroines. He animated Belle from Beauty and the Beast, Ariel from Little Mermaid, Jasmine from Aladdin, Mulan from Mulan, and Tiana from Princess and the Frog.
- He also animated Mickey Mouse in the Mickey Mouse Christmas Carol and Pete in the short Get a Horse. He was heavily involved with Olaf in Frozen.
- He moved to Florida to work in the new animation department at the recently opened Hollywood Studios. Here he worked on shorts such as Roller Coaster Rabbit, The Prince and the Pauper and Trail Mix-Up.He eventually worked on several films from the Florida studio as well, including Aladdin.
- He appeared in one episode of Full House, playing an animator from Disney!
- In more recent years, he has helped to instruct younger animators how to utilize the principles of traditional animation in CG animation, doing hand drawn overlays on character poses to better help bring life to the character animation.
- His filmography from his Wikipedia page:
1981 The Fox and the Hound Animator (Uncredited)
1983 Mickey's Christmas Carol Animator
1985 The Black Cauldron Character Animator
1986 The Great Mouse Detective Supervising Animator: "Basil" And "Dr. Dawson"
1988 Oliver & Company Supervising Animator: "Oliver" And "Dodger"
1989 The Little Mermaid Directing Animator/Supervising Animator: "Ariel"
1990 The Rescuers Down Under Supervising Animator: "Bernard" And "Bianca"
1991 Beauty and the Beast Supervising Animator: "Belle"
1992 Aladdin Supervising Animator: "Princess Jasmine"
1994 The Lion King Supervising Animator: "Young Simba"
1995 Pocahontas Animator: "Pocahontas"
1998 Mulan Supervising Animator: "Mulan", "Fa Zhou"
2000 The Tigger Movie Animation Consultant (Uncredited)
The Emperor's New Groove Additional Animator
2002 Lilo & Stitch Lead Animator: "Hula Dancers"
2004 Home on the Range Supervising Animator: "Grace", "Wesley", "Rusty" And "Pearl"
2006 Bambi II Supervising Animator: "Ronno"
The Fox and the Hound 2 Animation Consultant (Uncredited)
2007 Meet the Robinsons Animator
2009 The Princess and the Frog Supervising Animator: "Tiana"
2011 Winnie the Pooh Supervising Animator: "Winnie the Pooh" And "Christopher Robin"
2012 Wreck-It Ralph Additional Visual Development
2013 Saving Mr. Banks Animator: "Tinker Bell"
2013 Frozen Lead 2D Animator: Anna And Olaf
2014 Big Hero 6 Lead 2D Animator