He has been associated with the Cato Institute as an adjunct scholar since 1995 and a senior fellow since 2007. O'Toole was the McCluskey Visiting Fellowship for Conservation at Yale University in 1998, and has served as a visiting scholar at the University of California, Berkeley (1999) and Utah State University (2000). O'Toole studied economics at the University of Oregon, but did not receive a degree in economics. O'Toole's private consultancy is known as the Thoreau Institute.
Early in his career, O'Toole worked with environmental groups to oppose the United States Forest Service's subsidized sales of public forest timber to the timber industry. His book Reforming the Forest Service built on his experience during this effort, and proposed a number of free-market solutions to management of U.S. public land and timber. He has written analyses of the usage and development plans of a number of U.S. national forests, working with state environmental agencies and other groups.
In the 1990s, O'Toole emerged as an outspoken critic of New Urbanist design and smart growth strategies after learning in 1995 of a county plan to rezone his neighborhood to allow higher density and mixed use development. O'Toole contends that these development strategies—in which regulatory measures and tax incentives are employed to encourage denser development, more efficient land use, and greater use of public transportation—ignore the desires and preferences of most housing consumers and ultimately waste public funds. He has campaigned against smart growth policies and light rail systems in several U.S. states as well as in Winnipeg, Manitoba, and Ottawa, Ontario.
His 2001 book, The Vanishing Automobile and Other Urban Myths, was written as a detailed critique of these styles of planning. He continues to advocate for free market solutions to urban planning and design in his writing and teaching.
O'Toole has written three books published by the Cato Institute. The Best-Laid Plans argues that long-range comprehensive government planning necessarily relies on fads and fails to account for current and future public desires and needs. Gridlock looks at the history of transportation in America and argues that the future is in autonomous personal vehicles, not rail transit or high-speed rail. American Nightmare examines the history of housing in America and argues that zoning and, more recently, growth-management planning represents efforts by the middle- and upper-classes to separate themselves from the working class.
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While critical of government subsidies to all forms of transportation, O'Toole is a fan of passenger trains and an amateur rail historian. He currently runs a web site, Streamliner Memories, to share scanned copies of his personal library of railroadiana.
- The Vanishing Automobile and Other Urban Myths (Thoreau Institute, 2001) ISBN 0-9706439-0-X
- "A Desire Named Streetcar: How Federal Subsidies Encourage Wasteful Local Transit Systems", Policy Analysis 559: 1-16.
- The Best-Laid Plans (Cato Institute 2007) ISBN 978-1933995076
- Gridlock: Why We're Stuck in Traffic and What to Do About It (Cato Institute 2010) ISBN 978-1935308232
- American Nightmare: How Government Undermines the Dream of Homeownership (Cato Institute 2012) ISBN 978-1937184896.
- Reforming the Forest Service (Island Press, 1988) ISBN 0-933280-49-1
- The Citizens' Guide to the Forest Service Budget (self-published/Thoreau Institute)
- The Citizens' Guide to the Timber Industry (self-published/Thoreau Institute)
- O'Toole, Randall. "Mr. Budd's Historical Expeditions" (PDF). Minnesota History.
- Randal O'Toole. The Vanishing Automobile and Other Urban Myths: How Smart Growth Will Harm American Cities. ISBN 978-0970643902.
- Randal O'Toole. The Best-Laid Plans: How Government Planning Harms Your Quality of Life, Your Pocketbook, and Your Future. ISBN 978-1933995076.
- DeFusco, David (Winter 2003). "Alumna gives $1 million to endow McCluskey visiting fellowship" (PDF). Yale Environmental News. Yale University. p. 44. Archived from the original (PDF) on 21 August 2004.
- "10.20.99 - Endangered Species Act Failing to Protect the Nation's Wildlife". berkeley.edu. Retrieved 2018-10-11.
- "Biography - Randal O'Toole". prfamerica.org. Retrieved 2018-10-11.
- Congress for the New Urbanism. Debunking Cato: Why Portland Works Better Than the Analysis of Its Chief Neo-Libertarian Critic. Online website: "Archived copy" (PDF). Archived from the original (PDF) on 2014-06-20. Retrieved 2010-07-01.CS1 maint: Archived copy as title (link)
- Bill Steigerwald (November 5, 2007), "Meet the Anti-Planner". Townhall.com
- Stern, Ray (2010-04-30). "'Anti-Planner' Scholar Randal O'Toole Coming to Phoenix to Talk Up Gridlock Book". Phoenix New Times. Retrieved 2018-10-11.
- "Randal O'Toole: Taking Liberties With the Facts". Streetsblog New York City. 2009-06-02. Retrieved 2018-10-11.
- "Randal O'Toole: Highway Funding and Urban Form". Strong Towns. Retrieved 2018-10-11.
- "A Libertarian View of Urban Sprawl". Cato Institute. 2010-03-18. Retrieved 2018-10-11.
- Randal O'Toole, Gridlock: Why We're Stuck in Traffic and What to Do About It, https://store.cato.org/book/gridlock/
- Randal O'Toole, American Nightmare: How Government Undermines the Dream of Homeownership, https://store.cato.org/book/american-nightmare/.
- Meet the Anti-Planner Retrieved 2018-11-24.
- "A Son of Portland, Ore., Tries to Puncture the Myth of 'Smart Growth' - NYTimes.com". www.nytimes.com. Retrieved 2018-10-11.
- Thoreau Institute website; http://www.ti.org/aboutti.shtml
- "http://streamlinermemories.info/". streamlinermemories.info. Retrieved 2018-10-11. External link in