Message from the President

Founded in 2010, Ginkgo Sustainability Inc. was born out of a love for the environment and a passion for sustainable business. We are driven by our mission to connect the living and built environments through the installation of living roofs and the installation and manufacture of living walls.

Since our founding, our GingkoRoofs division has installed living roofs throughout Ontario, from the Waypoint Centre for Mental Health Care in Midland, to Exhibition Place in Toronto and the Perimeter Institute for Theoretical Physics in Waterloo. Our recently launched GingkoWalls division seeks to replicate the success of GingkoRoofs and is looking to establish a strong foothold in the living wall market.

In the coming years we aim to continue being the leading living roof installer in Ontario and to position our living walls division at the forefront of the industry. Through our dedication to high-quality workmanship, our clients, sustainable and ethical business practices, and to product research and innovation, we believe we can achieve these goals.

Our team has the depth of experience in the green building industry to realize our clients’ projects with excellence and efficiency, and to accomplish our business’ long term objectives. We also strive to expand our knowledge through continuous industry learning and study, with the Green Roof Professional accreditation program being one example.

With over 100 green roofing projects completed since 2010 and the development of our GingkoWalls division, we invite you to join Ginkgo Sustainability in connecting the living and built environments.

Christian Mahlstedt

Our Staff

  • Christian Mahlstedt bio picture

    Christian Mahlstedt


    President, Ginkgo Sustainability

    Christian is the Founder and President of Ginkgo Sustainability. Before he established GINKGO, Christian worked for a Kitchener-based roofing contractor’s green roofing division. Prior to his foray into business, for reasons unknown, Christian completed a degree in Philosophy. When he is not quoting, working with clients and suppliers, or getting his hands dirty on a roof, you may find him running an obstacle course or spending time in the wilds of southwestern Ontario.

  • Holly Horne bio picture

    Holly Horne

    BLA, GRP

    General Manager, Ginkgo Sustainability

    Holly joined GINKGO in January 2018 and brings with her a degree in Landscape Architecture and over 15 years in the the landscape construction industry. Her wealth of management experience will be valuable as she aims to further develop GINKGO’s market presence and manage the expansion of GINKGO’s divisions. When not managing the growing GINKGO team, Holly can be found cycling around the city or enjoying a game of beach volleyball.

  • Eduardo Rivera bio picture

    Eduardo Rivera

    Sustainable Energy and Building Technology Adv. Dip.

    Estimator, GinkgoRoofs

    Eduardo joined the team in 2013 as a Green Roof Technician before advancing to become GinkgoRoofs’ estimator in 2014. With over 15 years of experience in the construction industry, and an educational background in the field of Sustainable Energy, Eduardo applies his insight to every project. As the estimator, Eduardo spends most of his time analyzing drawings and specifications to ensure accurate estimates and proposals. When he’s not crunching numbers, there’s a good chance he’s out for a ride on his motorcycle or at the boxing gym de-stressing.

  • Donald D'haene bio picture

    Donald D'haene


    Project Manager, GinkgoRoofs

    Joining the company in January 2017, Donald brings extensive project management and green roof experience to GINKGO. Donald is part of the Project Management team and helps manage GINKGO’s relationships with clients and suppliers as well as GinkgoRoofs’ crews. Coming from Belgium, Donald brings with him a collection of language skills and a love of chocolate. He also brings an educational background in Landscape Architecture.

  • Christopher Smith bio picture

    Christopher Smith

    Project Manager, GinkgoRoofs

    Christopher has been with GingkoRoofs since 2012. As Project Manager, Christopher works with clients and suppliers, and helps manage GinkgoRoofs crews. Christopher had worked in the landscaping industry for a number of years before coming to GINKGO, and brought many useful skills with him, chief among these is his hardscaping experience. He also brought an English accent.

  • Jenny Moore bio picture

    Jenny Moore


    Project Manager, GinkgoRoofs

    Jenny joined GinkgoRoofs in 2014 as a Green Roof Technician, and moved into a Project Manager role in 2015. As Project Manager, Jenny works with clients and suppliers, and helps manage GinkgoRoofs crews. Jenny has worked in many different industries, and countries, and prior to GINKGO, worked as a welder. Outside of work, she enjoys spending time with her dog and travelling.

  • Bailey Wiebe bio picture

    Bailey Wiebe

    Greenspace Managment Dip.

    Maintenance Manager, GinkgoRoofs

    Bailey joined GinkgoRoofs in the Spring of 2016 as a Green Roof Maintenance Technician and shortly thereafter moved into the Maintenance Manager position. As Manager of the Maintenance Division, Bailey co-ordinates daily operations and performs green roof maintenance. Bailey has extensive horticultural experience and operated her own landscaping business before coming to GINKGO. When not on the roof, the Manitoba native can be found spending time with her dozy dog, watching baseball, and travelling.

  • Sasha Liston bio picture

    Sasha Liston

    Hon. BA, MSc

    Sales Manager and Research and Development Lead, Ginkgo Sustainability

    Sasha comes to GINKGO from Calgary where she worked as a Botanist at Green T Design. She brings with her an educational background in Plant Science, horticultural experience, and a commitment to the environment. In her dual role as GINKGO’s Sales Manager and Research and Development Lead, Sasha aims to increase GINKGO’s market presence and develop living wall and living roof technology. Outside of work, you may find her exploring the city on her bike.

  • Jordan Richie bio picture

    Jordan Richie

    BASc, GRP

    Project Manager, GinkgoWalls

    Jordan began working with green roof systems while completing his undergraduate studies in engineering and has followed this interest throughout his career, as seen in his prior roles as Director of Education and Accreditation at Green Roof for Healthy Cities (GRHC) and as a Research Associate with Environment Canada, where he modeled the effects of living architecture on the thermal performance of buildings. In his position as Project Manager, Jordan works with clients and suppliers to implement living wall designs and participates in research and development projects.