Louise McMahon (born January 18, 1873) was a central figure in establishing one of Lawton’s most enduring philanthropic institutions. She married Eugene P. McMahon in 1892 and arrived in Lawton with him in late 1901 following the opening of Indian Territory, where the family acquired property and began building deep civic roots.

After the death of her husband in 1936, Louise partnered with her son, Eugene D. McMahon, to honor Eugene P.’s life and values through the formal creation of the McMahon Foundation.

The Foundation was incorporated on June 27, 1940, with an initial endowment of $50,000.

Following the death of her son in 1945, Louise returned to Lawton and personally oversaw the Foundation’s operations for many years.

She was instrumental in constructing the current McMahon Foundation building and guiding its early grantmaking. Louise McMahon passed away on February 8, 1966, at the age of 93. Her stewardship established the Foundation’s enduring commitment to education, civic institutions, and long-term community investment.

Eugene P. McMahon (born November 1, 1862) was a respected businessman and civic leader whose life inspired the creation of the McMahon Foundation. After marrying Louise Davis in 1892, Eugene participated in the 1901 Lawton townsite lottery during the opening of Indian Territory and helped establish the family’s presence in the growing community.

Eugene worked in law, real estate, and insurance and served on the Lawton Board of Education from 1907 to 1917. He played a role in the construction of Lawton High School in 1910, now Lawton City Hall, reflecting his strong belief in public education and civic development.

Eugene P. McMahon died on May 15, 1936.

Although the Foundation was established after his death, it was created in his honor by his wife and son to reflect the values he lived by—service, responsibility, and investment in community institutions.

Eugene D. McMahon (born January 28, 1895) represented the next generation of the McMahon family’s civic and philanthropic leadership. Raised in Lawton, he attended Lawton High School, where—while still a student—he worked for the Lawton Constitution, gaining early experience in journalism and developing a strong appreciation for civic life and informed communities.

He graduated from Lawton High School in 1912 and earned a degree in journalism from the University of Oklahoma in 1915. During World War I, Eugene served in the U.S. Army Air Corps, reflecting a deep sense of duty and national service.

Following his military service, Eugene D. turned to oil and gas investments in East Texas and later settled in San Antonio in 1926. After the death of his father, Eugene P. McMahon, he partnered with his mother, Louise McMahon, to establish the McMahon Foundation in 1940 in honor of his father’s life and values.

Eugene D. McMahon died on July 7, 1945, at the age of 50. Though his life was cut short, his leadership helped formalize the Foundation and secure the McMahon family’s enduring commitment to Lawton and Southwest Oklahoma.