Attorney Colby M. Lessmann was born and raised in Sioux City, Iowa, and is a graduate of Sioux City North High School. Colby graduated from the University of South Dakota School of Business (B.S., 1996) and School of Law (J.D., 1999). During his law school education, he published a casenote in the South Dakota Law Review (1998) and was both the Managing Editor and the Production Editor for Volume 44 of the South Dakota Law Review (1998-1999). After graduating from Law School, Colby clerked for Justice Robert Amundson of the South Dakota Supreme Court in Pierre, South Dakota. In August 2000, upon completion of his clerkship, Colby returned to practice law in Sioux City, Iowa, where he practices in Iowa, Nebraska and South Dakota in the areas of General Litigation, Estate Planning, Wills, Trusts, Probate, Landlord Tenant Law, Collections, and Personal Injury, including but not limited to, car accidents, wrongful death, slips and falls, and dog bites.

Colby is a member of the State Bar Associations for Iowa, Nebraska and South Dakota. He is a member of the Probate Section for the Iowa Bar Association, the Woodbury County (Iowa) and Dakota County (Nebraska) Bar Associations, as well as a member of the Iowa Trust and Estate Council and the Iowa Association for Justice (formerly Iowa Trial Lawyers Association). He is also licensed to practice in the United States District Courts for the Northern District of Iowa, the District of Nebraska, the District of South Dakota, the United States Court of Appeals for the 8th Circuit, the United States Court of Federal Claims, and the United States Supreme Court.