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Leadership Team

David McIsaac
CHIEF EXECUTIVE OFFICER

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.

Harry Jongerden
GARDEN DIRECTOR

Harry has more than 40 years of valued experience as a professional gardener, garden designer and garden director. He is currently leading the Expansion Project at TBG, after leading the Garden as Executive Director for five years. Prior to his arrival at TBG, Harry held the posts of Garden Director at VanDusen Botanical Garden in Vancouver, Head of Horticulture at Royal Botanical Gardens, Ontario, and Head Gardener at the Stratford Festival.

Harry is the author of This Other Eden. His landscape designs include the Walkerton Heritage Water Garden and Stratford’s Elizabethan Garden. Well known in the professional gardening world, Harry is the Awards Committee Chair for the American Public Gardens Association as well as Chair of the Ontario Garden Council.

Paul Gellatly
DIRECTOR OF HORTICULTURE

Paul joined TBG in March 2020. A passionate life-long horticulturist, Paul was most recently the Curatorial Gardener for one of Canada’s largest tropical plant collections at the Toronto Zoo. He has a strong online following as the Tattooed Gardener, with social media posts reaching 10 million people per month. Paul was previously a gardener at the City of Toronto, worked for six years in the perennial plant department at Plant World, and was an estate gardener for a Trillium Award winning property in Carlisle, Ontario.

He is an avid plant collector of rare and unusual plants in addition to being an experienced day lily hybridizer, with 20 registrations with the American Hemerocallis Society. Paul’s home garden is featured in Tara Nolan’s book Gardening Your Front Yard: Projects and Ideas for Big and Small Spaces.

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Alison Kenn
DIRECTOR OF DEVELOPMENT

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
DIRECTOR OF MARKETING & COMMUNICATIONS

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. Prior to that, Jenny worked at Crescent School, North York Seniors Centre and Guelph University.

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 actively involved in the tourism sector as a member of Tourism Toronto and the American Public Gardens Association. She is the current Marketing Chair for the Toronto Attractions Council.

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Rochelle Strauss
DIRECTOR OF EDUCATION

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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Mark Hirowatari
FRACTIONAL CFO

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.

Tracy Mac Millan
FRACTIONAL HR LEADER

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.

Glenn Davidson
RETAIL SHOP MANAGER

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.

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