Liz Knight
From My Little Wiki
Liz Knight was a character designer for Hasbro from 1981-87, as well as the Director of My Little Pony in 2003 and VP of Girls' Toys from 2005-2013. Ponies that she designed include Applejack, Bubbles, Firefly, Moondancer, and the first set of Sea Ponies. She also worked with Lauren Faust as the latter wrote Friendship Is Magic.