Louise Davis McMahon

Following their marriage, McMahon and E.P. McMahon relocated to Minneapolis, where their only child, Eugene Davis McMahon, was born on January 28, 1895.^[2] In Minneapolis, McMahon taught private piano lessons, eventually garnering significant recognition for her teaching, while her husband worked as the superintendent of schools. After a brief period in Minnesota, the McMahon family moved to Troy, Kansas, and later, in 1901, settled in Lawton, Oklahoma. In Lawton, E.P. McMahon established a law practice, and McMahon continued her piano teaching, actively participating in the cultural development of the city.^[1][3]

In 1940, after the death of her husband, McMahon and her son Eugene established the McMahon Foundation in his memory with an initial fund of US$50,000 (equivalent to $1,122,209 in 2024).^[1] Over time, McMahon and Eugene regularly added to the foundation's assets, allowing it to support a variety of causes and organizations in Lawton and Comanche County. Among its early recipients were City Mission, the Lawton fire department, which received funding for a resuscitator, and the Negro Mission.^[1] As the foundation's funds grew, it began providing scholarships for journalism students, supporting individuals in need, and assisting churches, schools, museums, and other public institutions.^[1]

Following her son's death in 1945, McMahon moved back to Lawton, where she constructed a building for the McMahon Foundation on the site of the family's original residence.^[1] Completed in 1948, the building not only housed the foundation's offices but also served as a cultural and community center for various local groups. It hosted meetings and small conferences for organizations such as the Woman's Forum, music clubs, and the Great Plains Writers, with a policy against political or controversial gatherings.^[1][3]

In 1953, McMahon played a pivotal role in developing the McMahon Auditorium in Lawton, which was dedicated the following year in honor of her family. Through the McMahon Foundation, she continued to support the arts and education, including a US$300,000 (equivalent to $3,358,649 in 2024) grant in 1957 for establishing the Museum of the Great Plains.^[1] This museum aimed to preserve and exhibit Oklahoma's cultural history, including musical history, family records, and the history of Lawton's social and cultural organizations.^[1][3]

McMahon was actively involved in her community and held strong ties with the Presbyterian Church. Her charitable efforts and contributions to society were widely recognized, and she was named Oklahoma's Mother of the Year in 1949.^[1] She was inducted in to the Oklahoma Hall of Fame in 1954 in the music category.^[3] In addition to her philanthropic work, McMahon was an author and painter, publishing her memoir, Reminiscences and Scrapbook, in 1957.^[1]

McMahon died on February 8, 1966.^[2] In tribute to her legacy, the McMahon Foundation funded the construction of a fine arts building at Cameron University. Over subsequent decades, the foundation continued its work, contributing over $75 million by the end of the 20th-century to educational, cultural, and social projects in the region.^[1][3]