Our Team

Executive Director - Lex van der Raadt formed an interest in the environment from growing up on stories of adventure and exploration. His voracious appetite for knowledge led to degrees in archaeology and English, and a thirst for sharing with others all he has learned. In his spare time, Lex enjoys culinary experimentation, creative writing, and designing games.​​​​​​

Fund Development and Membership Coordinator - Crystal Mackenzie is a born and raised Calgarian. Her environmental consciousness began at an early age when the 3Rs, composting, and reusable grocery bags were everyday things in her home, long before it was common practice. Since then, her passion for a clean, safe environment for everyone has only gotten stronger. Her post-secondary schooling focused on education and communication techniques, and she uses this to share her deep passion for water and watershed health. Crystal also runs a local literary magazine, and is a creative writer and editor, in her spare time.

Bookkeeper - Surina Gupta

Communications and Volunteer Coordinator - Blair Kang


Program Staff

Coordinator, Green Workplace - Grace Wark has always been fascinated by the nature in her own backyard. Growing up exploring places like Nose Hill Park and Inglewood Bird Sanctuary sparked a curiosity for how wildlife persist within our cities and what we can do to co-exist within the urban landscape. After completing studies in Environmental Science and Geography, Grace started her career in the conservation sector, where she gained a strong interest in using community-based tools to support local ecosystems. She is excited to work with Calgary’s communities to promote sustainable ways of living and working in our beautiful city. Outside of work, Grace enjoys nurturing her veggie patch, exploring Calgary’s local wetlands and creating digital art.

Environmental Education Specialist, Green Kids & Generation Green - Stephanie Alcock is a certified teacher and worked as an elementary teacher in the UK. Since moving to Calgary in 2014, Stephanie has worked as an environmental educator with the Calgary Zoo and the City of Calgary’s Waste and Recycling team, and more recently managed the Youth Wavemakers environmental education program with CAWST. She has also worked with the Alberta Council for Environmental Education to campaign for more environmental topics to be included in the Alberta curriculum. Stephanie is currently studying for MSc Outdoor, Environmental and Sustainability Education through the University of Edinburgh.

Stephanie enjoys spending time outdoors while running, reading and camping, hiking in the mountains, as well as playing flute in musical ensembles.

Educator, Green Kids & Generation Green - Nancy Selin is a nurse with a great passion for teaching and learning. She has great memories of camping as a child and now as a mother of 3, she does the same with her family most weekends in the summer. A good camping weekend also includes an easy read and some bird watching. Her desire to learn more about how to care for our planet grew when she volunteered with her son's class on a field trip to the Material Recovery Facility. Together with her family, Nancy is learning how best we can care for the world in which we live and play.

Coordinator, Green Homes & Communities - Mafe Barrera has always been passionate about the protection of animals and plants. From her early years, she was involved in clubs and volunteer activities related to fauna and flora conservation in Colombia and following her passion, she studied environmental remediation. After moving to Calgary, Mafe has been volunteering with Immigrant Services Calgary to help newcomers be more conscious about the environment and its conservation. Mafe is now planning to study Environmental Sciences to keep building her knowledge and area of expertise. Besides her job, Mafe enjoys her free time playing any ball sports, especially volleyball.