These messages from students in Professor McDonnell's classes over four semesters express gratitude for his inspiring teaching style, helpful guidance, and support. They appreciate his humor, challenging insights, and life lessons. Students found his classes to be highly educational and beneficial. They thank Professor McDonnell for motivating them and helping them improve. His passion for teaching and using real-life examples was appreciated. Overall, the students express that Professor McDonnell had a very positive impact on their university experience.