Mount Sinai Health System (New York City). Mount Sinai Health System employs 38,000 people across its seven hospital campuses and other locations. The system offers it employees many benefits and perks, including a wellness program, continuing education opportunities, and discounts on tickets to shows, concerts, movies and other events. In 2016, DiversityInc named Mount Sinai Health System to its "Top 10 Hospitals and Health Systems" list.