Board of Directors

Colleen Cirillo, Secretary

Colleen has spent many years in the world of nature interpretation, protection and restoration, including over a decade at Toronto and Region Conservation and 2.5 years at Ontario Nature. From October 2015 to July 2020, she was director of education at the Toronto Botanical Garden. In this capacity, Colleen brought a conservation and sustainability perspective to existing programs, policies and practices. Colleen has served on many boards and committees, including the LEAF board from 2005 to 2008. She was thrilled to return in 2019.


Tenley Conway, President

Associate Professor, Geography, University of Toronto, Mississauga

For the past decade, Tenley has focused on the way residents and local groups interact with the urban forest in the Toronto area to better understand urban ecosystem dynamics.  She has a BSc from Cornell University and a MSc and PhD from Rutgers University.  Tenley is also involved with the scientific committee of the International Association of Arboriculture and the environmental education charity EcoSpark.  She has served on the LEAF board since 2017.


Stuart Grant, Treasurer

Business Services Manager, Semi-retired

Stuart managed a successful small corporation in midtown Toronto and has also served with local non-profit organizations since the 1990’s. He has brought administrative and financial experience to the LEAF board, serving since 2007.


Madhu Mahadevan

IT Consultant

Madhu Mahadevan is an Information Technology professional specializing in Cybersecurity. Having worked in organizations such as Sun Microsystems, Oracle and most recently at Okta, he is keen to share that experience and relevant best practices with LEAF.  He has served on the board since 2008.


Darby McGrath

Research Scientist, Nursery and Landscape, Vineland Research and Innovation Centre

Darby is a Research Scientist and Program Lead at the Vineland Research and Innovation Centre.  She works with the nursery-landscape supply chain including helping improve tree establishment in challenging urban settings. She has a MES and PhD from the University of Waterloo. She is also an adjunct professor at the University of Waterloo and Brock University. Darby was extremely excited to join the LEAF board in March of 2020.


Terrie Russell

Principal, Board Rx

Terrie Russell has been a successful entrepreneur and change management consultant for close to twenty years. As the sole proprietor of Russell Hille Associates, she is known for her independent and objective thinking and prides herself on delivering results. Terrie’s proactive and collaborative leadership style has built her reputation as a trusted and respected coach and colleague. Her track record includes many successive and long term assignments for a clientele of over 30 large and small organizations across both the private and public sectors. As a founder and principal of BOARDrx Inc. she is now devoting her time, energy and experience to bringing more effective governance, strategic thinking and innovation to the not-for-profit sector.  Terrie has served on the LEAF board since 2011.