The English Horn is part of the Oboe Family, pitched one 5th lower in pitch. Generally English Horn is considered a companion to the Oboe. There aren't many people who only do English Horn without also playing Oboe.
Shawn had first came across this instrument on his first day of Undergrad as a Music Major. On the first day of Wind Ensemble, the teacher had handed him the school's English Horn with an old moldy reed and had him play it that day. Yuck!