Ms. McCullough is an HR director of supply systems at Linde PLC. Linde is a leading industrial gasses and engineering company that employs approximately 80,000 people globally and serves customers in more than 100 countries worldwide. Linde delivers innovative and sustainable solutions, providing products, technologies, and services that help customers improve their economic and environmental performance in a connected world. Linde PLC was formed when Praxair, Inc. merged with Linde AG in 2018.

Ms. McCullough previously worked at Praxair as a global HR director. In that role, she provided strategic and tactical HR operations leadership to the vice president, the directors of global supply systems, and the vice president and directors of global procurement and materials management. Before that, she worked for over 10 years at Xerox as a customer experience program manager, an HR business operations manager, an HR manager for the supplies business group, and an HR programs and process manager; she also offered Lean Six Sigma Black Belt support to various managers and executives. Additionally, from 2010 to 2013, Ms. McCullough taught as an adjunct instructor for RIT's former First Year Enrichment program, which acclimated students to college life at the university.

Ms. McCullough formerly served as president and director of scholarships for the Black Women's Leadership Council Foundation; as a mentor for Women Helping Girls; as an HR chair of Mercy Residential Services; and was a program participant in Leadership Rochester. In February 2020, Ms. McCullough was selected as a recipient of RIT's Division of Diversity and Inclusion's (DDI) Alumnus Beacon Award. The DDI Beacon Award recognizes one alumnus/a who has shown exceptional leadership and fostered diversity, and whose career achievements reflect their dedication to the university and their respective community.