Read the following paragraph and determine if the hypothesis is true:

Morten Johannes Lauridsen (born February 27, 1943) is an American composer. A National Medal of Arts recipient (2007), he was composer-in-residence of the Los Angeles Master Chorale (19942001) and has been a professor of composition at the University of Southern California Thornton School of Music for more than 40 years.

Choose from: +Yes. +It's impossible to say. +No.
Hypothesis: Morten Johannes began teaching at the USC Thornton School of Music before 1979.
Yes