Our “Founding Father” is Brad McRae. He was a Senior Landscape Ecologist with The Nature Conservancy, but was struck down by cancer in 2017. He was an amazing man. His supervisor, Joe Fargione, wrote a wonderful eulogy: “…Everyone who knew Brad was impressed with his intelligence, thoughtfulness, integrity, honesty, and his steadfast commitment to what he cared about: his family, friends and conserving the natural world…”

“…Brad leaves an impressive legacy. He pioneered the use of circuit theory to model connectivity and gene flow across fragmented landscapes, and how to combine this with least-cost corridor theory. The software tools he developed, Circuitscape and Linkage Mapper, are now used in conservation planning around the world. He was passionate about supporting others’ efforts to use these software packages to make real changes on the ground…” Rest his soul.

Brad was the leader for Linkage Mapper Version 1.x, which includes five tools. He was joined by many gifted programmers and scientists in the endeavor. Darren Kavanagh joined the team early on to improve the code base and be the lead developer for Climate Linkage Mapper. Darren has also been very active and helpful in the release of Version 2.0. Tristan Nunez developed the climate corridor model, which became the basis for Climate Linkage Mapper. Viral Shah helped develop Circuitscape, which is the engine behind Pinchpoint Mapper and Centrality Mapper. Other noted contributors to Linkage Mapper Version 1.x were Brian Cosentino, Jeff Jenness, Andrew Gilmer, Theresa Nogeire, and Jenny McGuire.

In 2009, John Gallo developed a python script to not only map the linkages, but also prioritize among them. In 2013-14 Brad and John, who had met a decade earlier at a corridor workshop, found out about each other’s algorithms and met up again. They decided John should merge his algorithm into Linkage Mapper. John hired Randal Greene to be the lead developer for this project which became the Linkage Priority Tool of Version 2.0. In 2017 Brad asked John to take over as the leader for the entire Linkage Mapper project, and with Conservation Biology Institute committing to provide baseline support, John accepted.

Annie Prisbrey and Nik Stevenson-Molnar from CBI join John and Darren to help with week to week tasks, with additional involvement from Tim Sheehan, Mike Gough, Gwynne Corrigan, and Ann Van Zee.

Linkage Mapper Version 2.0 was assessed and improved by many great beta-testers and supporters, including Morgan Gray, Waverley Birch, Randal Greene, Mark Duttweiler, Indranil Mondal, Gretchen Fowles, Jesus Alarcon, Alejandro Gonzalez Bernal, Tania Urquiza, Diana Ramirez, Oscar Godinez, Wolke Tobon, Zaire Yaneth, Megan Jennings, Claudia Moreno, Angela Cuervo, Sylvia Ruiz, and Patricia Koleff.

The Washington Wildlife Habitat Connectivity Working Group’s (WHCWG) initiated all this with their 2010 statewide connectivity analysis, and they continue to develop the project via action research with several other analyses, past and present. Conservation Biology Institute helped develop Version 2.0 through action research in the Mojave Desert, Sacramento Valley, Modoc Plateau, and Santa Barbara County.

Linkage Mapper was bolstered by the direct financial support from from several other institutions. Linkage Pathways was developed with support from the Great Northern Landscape Conservation Cooperative, the Wildlife Conservation Society’s Wildlife Action Opportunities Fund, and the Nature Conservancy. The new modules of Version 1.x were supported by the North Pacific Landscape Conservation Cooperative and The Nature Conservancy.

Linkage Priority Tool was supported by South African National Research Foundation, Nelson Mandela Metropolitan University, Sonoma County Agricultural Preservation and Open Space District, the Islands Trust, the Wilderness Society, and Conservation Biology Institute.

Finally, the involvement and enthusiasm from the Linkage Mapper community has been the fuel for the project. Please continue that forth with additional discussion on the community group, and please chime in with answers to questions, even if only a partial answer. You can contribute and/or vote for code development on our Github site, and also post your projects result on our new and interactive shared maps Gallery.

One of Brad’s early decisions was to make Linkage Mapper an open source project. As a result, it is now a project for all us. Continuation of this project is now in dedication to both Brad, and his mission: conservation of the natural world!