THOUSAND ISLANDS WATERSHED LAND TRUST
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Board and Staff

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​Staff
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Executive Director: Calder Schweitzer
calder@tiwlt.ca

Calder began working for TIWLT in 2019 as a Field Biologist, and has now moved into the position of Executive Director. He holds a B.Sc. in Wildlife Biology and Conservation from the University of Guelph, which he attended as a McCall MacBain Loran Scholar. Calder has formerly volunteered for the Canadian Parks and Wilderness Society and Western Australia's Department of Conservation, Biodiversity, and Attractions.
Board of Directors
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President: Marnie Ross
​marnie@tiwlt.ca
Marnie was a Reading Recovery teacher and since retiring has found her passion in preserving nature and helping others achieve their conservation dreams. Helping others create a legacy is the most rewarding work. Marnie and Don were the recipients of the Ontario Land Trust Alliance Vision Award in 2010.



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​​Vice-President: Ed Lowans
 Ed led sustainable planning and design teams in North and South America and Asia. He represented Canada working on LEED® and historic projects. He is an inventor, author and speaker. Ed is an adjunct professor of sustainable planning, design, architecture, health and building science. When not saving the environment he is enjoying the youngest and the oldest  members of the clan. Ed spent his 70 summers on The River with antique boats.


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Secretary: John Ambrose
​John has a Master’s degree (forest management) from MacDonald College (McGill University). His career in environmental and resource management has taken him on assignments to 35 countries throughout Africa, Asia and Eastern Europe with CIDA, the World Bank and the private sector.
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​Director: Mary Jane Lamb

​Mary Jane was the graphic designer for St Lawrence Islands National Park. And she bred and raced horses at Woodbine. Leggolam, Mackenzie Delta and the amazing Crown Attorney. Mary Jane lives on her horse farm with her journalist daughter Kate and husband Tony. She is always conscious of involving the farming community.

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Director: Don Ross
​don@tiwlt.ca
Don has a Biology Degree from Western University and started his career as Chief Park Naturalist at Point Pelee National Park. When he moved to the Thousand Islands he found home. He was partner in Dave Jones Sports and Executive Director of the Frontenac Arch Biosphere. He is a founding member of TIWLT helped write the nomination papers for the UNESCO Frontenac Arch Biosphere and with Dave Warner, facilitated the transfer of properties to the National Park. 

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​Director: Dave Warner
Dave was Park Superintendent of St Lawrence Islands National Park. He is a founding member of the Canadian Thousand Islands Heritage Conservancy which became TIWLT. And he helped write the nomination papers for the Frontenac Arch Biosphere. He continues to work diligently on to help TIWLT and his neighbours.

  • Home
  • About
    • About TIWLT
    • TIWLT Map
    • About Land Trusts
    • AGM Reports & Audits
    • Board Members and Staff
    • Partners
  • News
    • Newsletters
    • Research >
      • Science and Shorelines
  • Get Involved
    • Conservation Options
    • Become a Member
    • Volunteer
    • Monetary Donations
    • Property Donations >
      • Donate Land
      • Conservation Easements
      • Land Stewardship
      • Tax Information
    • U.S. Taxpayers
  • Thousand Acre Challenge
  • Calendar of Events
  • Contact