Sullivan has performed as a soloist on many occasions with several orchestras including the Pittsburgh Symphony and Montreal Symphony. In 2006, he performed the world premiere performance of Jennifer Higdon's Trombone Concerto with Sir Andrew Davis and the Pittsburgh Symphony.
He performs regularly across North America, Europe and Asia as soloist and chamber musician alongside the world's leading brass players. He is a regular visitor to Japan, playing and teaching at the Pacific Music Festival in Sapporo, the Suntory recital hall in Tokyo, the Hamamatsu Summer Academy, as well as performing solo recitals in Osaka. In China, Sullivan is involved with the Canton International Summer Music Academy and performed and gave master classes at the Tian Jin and Beijing Conservatories in April of 2006.
Presently, Peter Sullivan serves on the faculties of Duquesne and Carnegie Mellon universities in Pittsburgh, following 15 years as adjunct professor at McGill University in Montreal. For the past few years, he has been working with the Yamaha Corporation on the development of their new line of orchestral trombones, the prototype of which he plays every week with the Pittsburgh Symphony Orchestra.