Meet the key members of our team led by CEO David McIsaac, who bring a diversity of experiences, talents and creativity to the garden we have today and envisioning our future garden.

David McIsaac

David joined TBG in April 2019 as Interim Chief Administrative Officer and leveraged his experience in organizational transformation to lead TBG through a period of financial stabilization. Appointed to the position of Chief Executive Officer in September 2019, David led the organization through a period of transition, re-establishing financial health and eliminating the deficit from the prior year. His leadership will be instrumental in advancing TBG’s Master Plan of becoming an expanded, world-class botanical garden and cultural institution for the City of Toronto.

David brings over 25 years of leadership, financial and operational experience in the corporate and not-for-profit sectors to his role. He has held senior leadership positions with TransUnion Canada, Northern Trust Canada, Aviva, Manulife, CIBC and RBC. He is a long-standing supporter of not-for-profit organizations and has held various Board and Committee volunteer leadership roles with Casey House, Arthritis Society, the Victorian Order of Nurses, Prostate Cancer Canada, and Financial Executives International (FEI) Canada.

David is a Chartered Professional Accountant and holds a BA from the University of Toronto.

Tracy Mac Millan

Tracy joined TBG in September 2019. Tracy is Principal of TEM Enterprises, and has 20 years of experience in the HR field. During her career, she has held senior management positions in both unionized and non-unionized manufacturing facilities mainly in the automotive and aerospace sectors. Since branching out on her own in 2016, Tracy has been providing HR consulting services to clients in both Canada and the U.S. including many in the not-for-profit sector.

Tracy brings a broad knowledge of topics such as employment legislation, labour relations, health and safety, training, benefits, compensation, organizational development and succession planning to TBG.

Mark Hirowatari

Mark joined TBG in February 2020. A seasoned finance executive, Mark brings a focused knowledge to the organization, distilling high-level strategy into goals and objectives. Prior to joining TBG, Mark spent the past seven years in the not-for-profit sector including two and a half years as the Interim CFO for the Royal Ontario Museum. Prior to joining the ROM, he worked in Tokyo for approximately 10 years for large multinational companies including Avon Products and Oracle Corporation as country CFO. During his time in Tokyo, Mark managed teams in other parts of Asia, including China, India and Australia while reporting into headquarters located in the U.S. and Europe.

Mark started his career at PwC. He graduated from the University of Toronto and is currently a member of CPA Ontario holding CPA, CA.

Alison Kenn

Alison joined TBG in November 2019. With more than 25 years of fundraising and special event experience in the not-for-profit sector, she has worked in education, healthcare, politics and the arts. Organizations that she has worked for include the University of Toronto, the Ontario PC Party, Canadian National Institute for the Blind, JAZZ.FM91 and Easter Seals Ontario.

Alison has an interest in our natural heritage and horticulture, and spent many years working in a Scarborough nursery while she was in high school and university. An enthusiastic birder, Alison continues to increase her knowledge of our local flora and fauna. She is a graduate of the University of Toronto.

Jenny Rhodenizer

Jenny has worked in the charitable sector for over 25 years with educational institutions serving elementary and university students as well as life-long learners. She has been leading the brand stewardship, public relations, event management and marketing efforts at TBG since 2002.  Jenny is a creative thinker who is resourceful and offers thoughtful marketing solutions. She is focused on building visually compelling stories for the garden’s online community while forging sustainable strategic partnerships and creating fun, engaging (and delicious) public events.

Jenny is Marketing Chair on the Toronto Attractions Council, a member of the American Public Gardens Association and is actively involved in the garden tourism sector.  

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Rochelle Strauss

Rochelle has over 20 years’ experience working as an education consultant, predominantly in the non-profit sector. She specializes in program design and exhibit development, creating dynamic outcomes-based programs and curating content and experiences that bring learning to life. Over the course of her career, Rochelle has been involved in programs and projects at local, national, and international levels, including working with IOC-UNESCO, Girl Guides of Canada, Ontario Science Centre, Art Gallery of Ontario, and Royal Ontario Museum.

An award-winning children’s author, Rochelle’s non-fiction books weave science and imagery to build empathy for nature and inspire young readers into action. Rochelle’s books have been published internationally, featured in curriculum programs, and incorporated into anthologies. She recently completed her third book which will be released by Kids Can Press in the spring of 2022.

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Glenn Davidson

Glenn joined TBG in December 2019. Glenn has worked in the retail sector for more than 20 years including the last 15 with the LCBO holding various positions including retail training consultant, manager and most recently as a product consultant.

Glenn brings with him a passion for horticulture. He was already a TBG member prior to joining as Shop Manager and has attended many TBG events including Canada Blooms and the Holiday Market. Glenn previously owned his own landscape design company which furthered his love for plants and nature. His other passions include hockey and volunteering. He has been a hockey coach for over 30 years and has held executive positions with various hockey associations.