Mark Stephen Wrighton is an American academic, an award-winning chemist, and the current chancellor of Washington University in St. Louis. The Chancellor is the University's chief executive officer. The operating revenue for the year ending in June, 2013 was $2.4 billion, with approximately 6500 undergraduates and a similar number of graduate and professional students, and about 13,000 full time employees, including about 9,000 who are associated with the School of Medicine and its education, research and clinical programs. The University has about $6.9 billion of invested assets.