Gang Xu is a lecturer at the Perimeter Institute specializing in theoretical physics with a focus on cosmology. In his role, he engages in scientific programs that advance educational outreach and training in physics. Gang teaches courses on Quantum Field Theory, which is a core area of theoretical physics, exploring the foundational concepts and applications of the field. His lectures cover both the qualitative and quantitative aspects of Quantum Field Theory, emphasizing its relevance and practical applications in understanding complex physical phenomena. He is committed to fostering a deep understanding of these concepts among students, equipping them with the necessary knowledge and skills for advanced studies in physics. His contributions to the field and educational programs at the Perimeter Institute illustrate his dedication to both research and teaching, making significant strides in disseminating knowledge and stimulating interest in theoretical physics.