Bill Butler is a choreographer.
Biography
Bill Butler, also known as Mr. Charisma, is a roller skater and choreographer credited with the invention of jammin’.
The National Museum of Roller Skating referred to Butler as the creator of the “Jammin” skate style (technique), stating that "Butler’s iconic moves and styles inspired many of the popular moves and styles of today"
The New York Times and The City Reliquary have referred to Butler as "the Godfather of Roller Disco".
From the Wikipedia article “Bill Butler (skater)”, licensed under CC BY-SA 4.0.
Facts from Wikidata (Q131807279), CC0.