“The blue light emanating from our cell phones, our tablets and our laptops is playing havoc on our brain chemicals: our serotonin, our melatonin. It's screwing up our sleep patterns, our happiness, our appetites, our carbohydrate cravings.”

Canadian personal trainer, motivational speaker, and author

Harley Samuel Pasternak is a Canadian personal trainer, motivational speaker, and author. He is known for working with a range of celebrity clients and for co-hosting ABC's 2012 daytime talk show, The Revolution. His public profile is built around fitness and motivation. As a trainer, he has worked with well-known clients, and as an author and speaker he focuses on health, discipline, and practical advice for living well.