the Opera and in "Back to School" when Arnold's grandpa returns to school for a grade school diploma while in fifth grade, during his rapid progress from fourth through to sixth grade. Miss Slovak (voiced by Tress MacNeille) is Arnold's enthusiastic teacher (in the first season and part of the second season). She leaves teaching to pursue a career in golf. Mr. Robert Simmons (voiced by Dan Butler) is Arnold's sensitive and caring teacher (since the second season). He replaced Miss Slovak. He emphasizes the unique value of every individual in his class, with his constant reminding that "you are all special in your own special way". In the episode "Principal Simmons" he becomes principal at P.S.118 but then when the entire student body started rebelling against him, he and Arnold went to Principal Wartz's house and begged him to come back to the school but also made him promise to not be so tough on the students. Mr. Simmons then went back to being a teacher. In The Jungle Movie he became Arnold's fifth-grade teacher and he chaperoned his students on the class trip to San Lorenzo. In 2018, Bartlett confirmed that Mr. Simmons was gay, which had been alluded to in the episode "Arnold's Thanksgiving" with the appearance of his partner, Peter. Nurse Shelly (voiced by Mary Gross) is the school nurse, and Sheena's Aunt. She had some speaking parts in some episodes. In the episode "Rhonda's Glasses" she gave Rhonda an eye test and helped her with her motion sickness. In the episode "April Fools Day" she helped Helga with her temporary blindness. Coach Jack Wittenberg (voiced by James Belushi) is the competitive school coach of many sports teams, which he often gets Arnold and his friends to join. He is portrayed as an aggressive and incompetent coach, and as such, is unable to motivate and guide his team properly. With Arnold's help, he is able to lead his team to victory, as in the episode "Synchronized Swimming", and is revealed to have a sensitive and considerate side. He has a poor sense of vocabulary, as he often mispronounces words while confidently verbose. In the episode "Best Man" he asks Arnold to be the best man in his wedding and also had Gerald, Sid and Stinky as his groomsmen. Tish Wittenberg (voiced by Cathy Moriarty) is Jack's wife who is the coach of the girls' teams. She