Gary Keller,co-founder of Keller-Williams Realty and an author on the New York Times bestsellers list, will host a free seminar on business success from 8:30 a.m. to noon Thursday at the Iowa Events Center. Keller's book, "The ONE Thing," will be the focus of the seminar. In the book, Keller writes that behind every successful person is his or her "one thing" and regardless of how success is measured, only the ability to dismiss distractions and concentrate on that one thing stands between you and your goals.