Dr. Warren Hill has been in private practice in Mesa, Arizona for the past 30 years. He completed his ophthalmology training at the University of Rochester in New York and has since devoted the majority of his career to challenging anterior segment surgery and the mathematics of intraocular lens power calculations. He is best known for his work in helping physicians to obtain accurate IOL power calculations. His web site doctor-hill.com and the ASCRS post-refractive calculator, developed with Doug Koch and Li Wang, are two of the most popular IOL power calculation resources in ophthalmology, with a combined total of over 150,000 views per year. In 2014, Dr. Hill gave the ASCRS Innovator’s Lecture and in 2015 year gave the AAO Charles Kelman Lecture.