Rozsansky provides his services to adolescents, adults, sports teams, and small businesses. He started working as a nutrition consultant since 2000. During his career as a nutritionist, he has served a wide variety of patients, ranging from professional athletes, college students, and actors, to working professionals, teens, fashion models, and pregnant moms. Rozsansky has helped his clients to enhance their athletic performance, improve their physical and mental health, and make positive lifelong eating and exercise behavior changes. Yosef worked as an independent sport nutritionist at Columbia University Athletics and also at Barnard College Student Health Services. There he assisted student athletes to achieve peak performance by providing individual and group nutrition counseling and by giving team presentations. Additionally, Yosef Rozsansky holds a Master of Science degree in Applied Physiology and Nutrition from Teachers College, Columbia University, where he also completed his dietetic internship. Moreover, Rozsansky received his Bachelor of Science degree in Dietetics from the University of Wisconsin-Madison.