About our Founder

Growing up in South Africa, Hayley saw the effects of social injustice firsthand — and the power that a fierce passion and shared purpose can have in bringing about positive social change. It was this discovery early in life that inspired her to pursue her passion for telling stories and driving action, ultimately founding the Additive Agency.

Under the banner of Additive, Hayley and team have developed brand strategies, stories and experiences for clients as diverse as the City of Memphis, Columbia University School of Professional Studies, Community Foundation of Louisville, FHI 360, Foster America, Harlem Children’s Zone, Hazelden Betty Ford Foundation, The Jed Foundation, La Jolla Playhouse, New 42/New Victory Theater, NYU Grossman School of Medicine, Mount Sinai, Mercy Corps, Phoenix Children’s, Syracuse University, St. Jude Children’s Research Hospital and World Wildlife Fund, among others.

Prior to founding Additive, Hayley led large-scale brand transformation efforts at Siegel+Gale for clients such as
the Y (YMCA), Aetna, Rotary International and Memorial Sloan Kettering, and launched new brands, such as Understood.  She also developed corporate social responsibility programming benefitting social enterprises in Africa and Asia.

Previously, Hayley managed public affairs at Columbia University, where she was responsible for protecting and promoting the reputation of the Law School, its faculty and programs. Additionally, the first years of her career were spent working with advocacy and affinity groups to shape the conversation around infectious diseases and destigmatize issues like depression.

Hayley is an adjunct faculty member at Columbia University, where she teaches a graduate class called “Purpose-Driven Communications,” and mentors students participating in the annual Greater Good Challenge. She serves on the boards of Democracy Works and the Tyler Clementi Foundation, and lives in Brooklyn, NY with her family.