Trisha Collern was the Astronomy teacher at Millard High. She was the school's typical "cool teacher". She praised her students for little things and treated each and every one of them like individuals. She even spoiled her students by giving them treats like money if they did good on a test. During her time working at Millard High, she had never once had to raise her voice at a student. A couple of parts after she replaced Professor Nova, the Board of Education had to let her go and get rid of the whole Astronomy class due to budget cuts in the school district.