Marcus Loh is a director at Temus, where he leads strategic communication, public affairs, and marketing for Temus.

Prior to Temus, he was the group executive director of Waggener Edstrom Worldwide, a Seattle-founded global communication firm. Marcus served as the president of the Institute of Public Relations of Singapore from 2019 to 2021, steering the industry body through the challenges of Covid-19.

Marcus is a corporate philanthropy advocate, serving as a Fellow of the National Volunteers & Philanthropy Centre's Company of Good initiative and on the Board of Governors for the UOB-SMU Asian Enterprise Institute, the SG Tech Digital Transformation Chapter, and the Singapore University of Social Sciences Industry Advisory Committee. Additionally, Marcus is the Patron of Every Child Matters, a charity focused on making STEM enrichment activities available to all children, particularly those from vulnerable families.