Our History

Our Sioux City history can be traced back to 1891, when attorney George Conway moved to Sioux City and began his law practice in the Iowa Savings Bank building. In 1918, Jacob C. Gleysteen was admitted to the firm as a general practice partner. His son, John W. Gleysteen, joined the firm in 1935, launching the ​“Gleysteen era,” a period spanning an impressive 63 years. 

Heidman Law Firm built its foundation on litigation and business law. Over time, the firm has expanded, admitting partners offering expertise in a wide variety of practice areas to better serve our clients’ needs.

The firm has changed its name and office locations within downtown Sioux City several times since 1891. Most recently, it was renamed Heidman Law Firm, coinciding with the firm’s move in 2006 to the newly renovated historic Evans Block Building.

Sheldon, Iowa native Paul Wolff founded the firm in his hometown after graduating from the University of Minnesota Law School in 1935. 

Paul’s office was on the 2^nd floor of a main street building that, in the 1930s, housed all of the Sheldon lawyers. In 1957, the Paul Wolff Law Office was moved from the 2^nd floor of this building to the north side of the Iowa Theater building.

In 1973, Thomas J. Whorley joined the firm. Jack De Hoogh joined the firm in 1978, which was then located to 218 Ninth Street. The firm operated from that location until 2002, when it moved into its current location at the Security Professional Plaza building. In 2017, the two office locations merged under the name Heidman Law Firm.

Our Mapleton chapter is a new page in our history. In July 2025, the firm opened a new office location in Mapleton, Iowa. This expansion will bring the services of our firm to Mapleton and the surrounding communities.