Skip to main content


Greg Kozak

Greg Kozak

Director, Sustainability

Greg joined sustainNU in September 2019. As director, Greg is responsible for the development, coordination, and implementation of Northwestern’s sustainability programs. A core component of this work involves collaborating with administrators, faculty, staff and students to integrate sustainability into both the operational and academic functions of the University.  His expertise is in the areas of global and U.S. climate change policy and regulations, carbon markets, greenhouse gas management, and sustainability.

Greg came to Northwestern from United Airlines where he led cross-divisional sustainability programs and provided leadership to United’s environmental strategy, reputation, and related advocacy and communication efforts. Prior to joining United, he worked as an environmental consultant assisting clients in various industries on environmental issues including sustainable business practices and sustainability strategy development.

Originally from South Bend, Indiana, he now lives in Chicago where he enjoys live music and traveling with his wife and two children. Greg earned a B.S. in Environmental Engineering from the University of Notre Dame and a master’s degree from the University of Michigan’s School for Environment and Sustainability.
Julie Cahillane

Julie Cahillane

Associate Director, Sustainability

Julie Cahillane has been with Northwestern University since 1994. Julie supports the development and implementation of Northwestern's Strategic Sustainability Plan (SSP), including waste reduction and diversion efforts. She began her career at Northwestern as the Recycling Coordinator and continued to expand environmental initiatives across the institution before the creation of Northwestern's sustainNU program.

Previously, Julie worked as an education coordinator for a national recycling company designing solid waste education programs addressing waste reduction, recycling, and recycled product procurement. Julie also served as Recycling Coordinator for the State of Illinois. In the position, she was responsible for the statewide office recycling program. She was appointed to the State of Illinois Task Force on Developing Markets for Recyclable Materials. Julie began her career in media relations, working in the Press Office of both the Illinois Governor and Secretary of State.

Under Julie’s guidance, Northwestern's recycling efforts have been recognized with awards from the Illinois Recycling Association, the IL Governor’s Pollution Prevention Awards, and the American Forest and Paper Association. Her interest in sustainability stems from an inherent sense of respect for the natural world and a desire to maintain balance and appreciation for all living things.

When she is not focusing on sustainability, she volunteers her time working with a no-kill, dog rescue organization in Chicago.

Cria Kay

Cria Kay

Program Administrator, Sustainability

Cria joined sustainNU in July 2021. She manages sustainability efforts across the Northwestern campuses, including the Green Labs and Green Office Certification programs. Cria supports the implementation of Northwestern’s Strategic Sustainability Plan and works with students, faculty, staff, administrators, and community members to further incorporate sustainability into both the culture and function of the University.

Cria has expertise in urban wildlife ecology, water affordability, and environmental justice. Before joining Northwestern, Cria worked with Lincoln Park Zoo’s Urban Wildlife Information Network, where she managed an international collaborative of urban ecologists. Cria is particularly interested in how race, class, and gender intersect with environmental policy, planning, and design.

Originally from central Ohio, Cria grew her roots in the Midwest, earning a B.A. in Environmental Studies, Comparative American Studies, and Geology from Oberlin College and an M.S. in Environmental Justice and Environmental Informatics from the University of Michigan’s School for Environment and Sustainability. In her free time, Cria volunteers with activist organizations fighting for water security in the Greater Chicago area, kayaks any chance she gets, and is often found crafting.