Duane was raised in Western Kansas, the oldest of four brothers. His father was a school principal and superintendent, and his mother a teacher. He graduated Fowler High School in 1974, Fort Hays State University in 1977, and Washburn University School of Law in 1980. Duane married Donna, a practicing attorney and fellow 1980 graduate of Washburn, in 1979. On graduating law school, he served as the law clerk to the Hon. Corwin C. Spencer of Oakley, judge of the Kansas Court of Appeals. In 1982, Duane joined McMaster & McMaster in Wichita, practicing insurance defense with D. Lee McMaster. In 1988, Bryce Abbot and Duane founded the Wichita satellite office of Wallace, Saunders, Austin, Brown & Enochs, Chartered. He practiced in that office, principally insurance defense and insurance coverage, until early 1998, at which time Duane resigned and took a break from the practice, with he and his wife moving to Orlando to fulfill their skydiving hobby. Duane sat for the Florida bar February 2000, and was sworn in as a member of The Florida Bar in April 2000. He worked on a team of lawyers prosecuting wrongful termination of distributorship claims on behalf of the Roger Maris family against Anheuser-Busch, and later for the Luks Santaniello law firm (based in Ft. Lauderdale) in its Orlando office. In 2003, Duane and his wife moved back to Wichita, where he was of-counsel for the Hinkle Law Firm from early 2003 until mid-2011, practicing a mix of insurance defense, insurance coverage, and plaintiffs' work. In July 2011, Duane resigned from Hinkle and established a solo practice devoted to representing claimants in insurance bad faith, medical malpractice, and other bodily injury claims.