Bill Neigh

Bill Neigh is an Earth pony professor with a gray coat, white mane and tail, and blue eyes. He appears in the episodes The Crystal Empire - Part 1 and Trade Ya! He is unnamed, being called simply "Professor" in the credits, but he is named in merchandise and other depictions.

Design and development
Bill Neigh shares his color scheme with "Sterling Silver". His name is a play on Bill Nye.

Depiction in the series
Bill Neigh first appears during The Failure Song in The Crystal Empire - Part 1. He checks Twilight Sparkle's recitation of the square root of 546 being 23.36664289109 and subsequently proclaiming "She is correct!" The episode's ending credits mistakenly credit Andrew Francis for the voiced role; Jayson Thiessen and Daniel Ingram have stated that he is voiced by Jayson Thiessen.

Bill Neigh later appears in Trade Ya!, managing a stall at the Rainbow Falls Traders Exchange and appearing at several points throughout the episode; in two such shots, he is seen conducting trades with Joe.

Appearances
Times are approximate.

Other depictions
Bill Neigh is a playable character called "Professor" in Gameloft's mobile game, added to the iOS version of the game on December 9, 2013 and to the Android version on December 17, 2013. His in-game description states "''Professor is a very smart earth pony with a molecule for a cutie mark. He always has some square roots to calculate!"

Merchandise
In Enterplay's collectible card game, Bill Neigh is named on his card, the Gen Con Indy 2013 demo version of which names him "Bill Neigh" with a trademark symbol and the α #52 C and α #ƒ21 versions of which name him "Professor Neigh". All three versions of the card attribute to him the quote "Now if you'll excuse me, I have some square roots to calculate. See ya!"

Quotes
"She is correct!"

- The Crystal Empire - Part 1

"Now if you'll excuse me, I have some square roots to calculate. See ya!"

- Enterplay collectible card game Gen Con Indy 2013 demo card of Bill Neigh and α #52 and α #ƒ21 cards of Professor Neigh