Cullinan's civic participation began in Houston not long after graduating from Ogontz. She became a founding member of the three Houston non-profits: the
Contemporary Arts Museum, the
Society for the Performing Arts, and the
Houston Ballet. She also served on the boards of numerous other non-profit organizations in Texas. In 1978, the Society of Texas Architects honored her for that generosity. Cullinan's philanthropic work reached many areas of Houston city life. She served as a board member of the Child Guidance Center, the Houston Mental Health Society and the National Parks Commission. In 1982, she was one of four city residents to be honored in 1982 by Mayor
Kathryn J. Whitmire for her gifts to the arts. Later that year Cullinan was honored at a dinner held by the Texas Project for the Archives of American Art. In addition, Cullinan was known for her frequent, anonymous donations that carried few restrictions for the recipients. ==Death==