Marc Sagal is a sport and performance psychology consultant and executive coach based in San Diego, California. He co-founded Winning Mind LLC in 2001 with Mark Lowry and serves as its managing partner. The firm helps athletes, executives, and military units perform under pressure, and it administers the TAIS assessment.

Before Winning Mind, Marc was Chief Operating Officer of Enhanced Performance Systems (1995 to 2001), the firm founded by Dr. Robert M. Nideffer that pioneered attentional-style assessment. His client work spans three environments: elite sport, including Olympic and professional athletes and clubs such as Liverpool FC; business, including McKinsey & Company, Hewlett Packard Consulting, and J.P. Morgan; and the military, including US Army Recruiting and special operations units.

His work has been featured in CIO magazine, Men's Health, FOX Sports, and American Airlines' Celebrated Living. He has presented research at the European Association of Personality Psychology and the American College of Sports Medicine.