Mr. Poulsen is a short, balding man with thick eyebrows and a massive comb-over. He is the biology teacher at Meridian High School.
- When Michael Vey arrived late for class, Mr. Poulsen welcomed him and accepted his tardy slip from Mr. Dallstrom. He then begins asking the class questions about electricity's role in the human body.
- During detention, Michael studied for Poulson's biology test.