investing in shallow oil in the 1920s and 1930s. In 1935, Herb Gussman, Nadel’s son-in-law, joined the company. Gussman would later go on to lead one of the largest oil producing companies in both Osage, Oklahoma and Kansas and make significant contributions to the modern oil industry and community in Tulsa, Oklahoma. Stephen Heyman and Jim Adelson joined the leadership team in 1965 and 1986, respectively, and still guide Nadel and Gussman today. Under their leadership, Nadel and Gussman grew aggressively into other basins in the United States.