Dennis was born in Kingman, Kansas, and received his B.A. degree (magna cum laude) from Washburn University in 1969 and his Juris Doctor degree (cum laude) from Washburn University in 1972.

Dennis has been active in Kansas Bar Association, being twice elected to the Kansas Supreme Court Nominating Committee and serving as a member of the Board of Governors, Secretary-Treasurer, Vice President and as President of the Kansas Bar Association in 1994. He is a member of the National Health Lawyers Association and a fellow of the American and Kansas Bar Associations. Dennis has also been a member of the Board of Governors and Vice President of the Wichita Bar Association. He has been recognized by his peers for his expertise in commercial litigation with his listing in “The Best Lawyers in America.” He has also been recognized in Chambers “America’s Leading Business Lawyers” for his work in commercial litigation and alternate dispute resolution and was selected for inclusion in the “Missouri and Kansas Super Lawyers” listing, designated as one of the top 100 lawyers in Missouri and Kansas.

Dennis Gillen specializes in business and business litigation, construction, health care, individual representation and general civil litigation. He also frequently serves either by court appointment or agreement of the parties as a mediator or arbitrator in civil disputes.