Jarrett Walker is an international consultant in public transit network design and policy, based in Portland, Oregon.  He has been a full-time consultant since 1991 and has led numerous major planning projects in cities and towns of all sizes, across North America, Australia, and New Zealand.  He is also the author of Human Transit: How clearer thinking about public transit can enrich our communities and our lives (Island Press, 2011). He is President of Jarrett Walker + Associates, a consulting firm that provides advice and planning services North America.