Mr. Ratburn is a fictional character from the animated children's television series Arthur. He is the third-grade teacher at Lakewood Elementary School and is known for his strict yet fair teaching style. Mr. Ratburn is passionate about education and often encourages his students to think critically and work hard. In addition to his teaching, Mr. Ratburn has a love for chocolate and enjoys sharing his interests with his students. He is a supportive figure in their lives, helping them navigate various challenges and learn important life lessons throughout the series.