About Us

Jarrett Walker, Founder and CEO


Jarrett Walker, PhD, is an international consultant in public transit network design and policy. A specialist in bus network design, he has been a full-time consultant since 1991 and has led numerous major planning projects in North America, Europe, Australia, and New Zealand. He is President at Jarrett Walker + Associates, based in Portland, Oregon.

He is the author of the popular public transit blog HumanTransit.org, and the book Human Transit: How Clearer Thinking about Public Transit Can Enrich Our Communities and Our Lives (Revised Edition, Island Press, 2024). This book is a friendly, non-technical introduction to transit’s underlying geometry, and the real value judgments that must be explored to make both transit and development policy. His background integrates an arts and humanities PhD (Stanford, 1996) with long technical experience in all aspects of transit and its role in city-building. He is a frequent keynote speaker, teacher, and facilitator of decision-making processes.

[email protected] 503 208 4249

Michelle Poyourow, Principal Associate


Michelle Poyourow is a consultant in public transit and multi-modal planning and policy. As a Principal Associate, Michelle works directly with clients to deliver successful projects and products, from major public events to corridor-level plans. She is currently leading our European work from Portugal.

A skilled project manager, she has managed projects involving multiple public agencies, multiple firms, large and impassioned stakeholder groups and elected officials. She ran her own consulting firm for three years, handling all aspects of the business, before joining JWA in 2012.

Michelle’s analysis and planning experience spans issues of transit operations, transportation demand management, transit oriented development, complete streets and the integration of transit and active transportation. She has planned and conducted successful public engagement processes, and led inter-agency collaboration among transportation, transit, education and enforcement departments. Her experience as a political aide and advocacy director also gives her a high attunement to the political sensitivity and messaging elements of each project.

Scudder Wagg, Principal Associate

Scudder Wagg is a consultant in public transit and multimodal transportation planning. His focus is on transit network redesign, facilitating conversations about multimodal planning issues, and applying innovative mapping tools to enrich conversations about planning issues. Scudder’s wide ranging experience in transportation planning includes network planning, multimodal transportation analysis, and environmental studies for state agencies, metropolitan planning organizations, local governments, and transit agencies.

He has also successfully directed public and stakeholder outreach on numerous local, regional, and statewide transportation projects using his technical knowledge and broad experience to make transit and multimodal planning issues understandable to a wide audience. Scudder is based in the Washington, DC area.

Evan Landman, Principal Associate


Evan Landman is a transit analyst and planner who fills a wide range of roles at Jarrett Walker + Associates, leading data analysis and the production of visual explanations, such as maps, graphics and charts, as well as contributing in a variety of ways to network planning tasks. He is also JWA’s “chief innovation officer,” developing new tools and techniques for visualizing transit data and engaging the public in transit decisions.

Evan holds a Bachelor’s of Arts in Human Geography from the University of British Columbia, where he focused on urban studies, and has extensive multidisciplinary training and experience in all aspects of data analysis and cartography related to transit. He is excited to help contribute to the continued development of methods of gaining new insight from transit data.

Daniel Costantino, Principal Associate

Daniel #3

Daniel Costantino is an experienced urban planner and project manager with expertise in transit planning, sustainability consulting, environmental permitting and disaster recovery. As a Senior Associate, Daniel manages projects and works directly with clients. He analyzes transit service design and performance; drafts future plans and policies; facilitates stakeholder workshops; and prepares public-facing materials.

Daniel’s past clients have included public transit agencies, local and state governments, and for-profit companies in the United States and abroad. Daniel also brings years of hands-on practice as a GIS and data analysis on transportation, public health, urban design and neighborhood development projects. Daniel’s combination of technical and people-focused experience has honed his ability to communicate complex information to many audiences and to support confident decision-making.


Gavin Pritchard, Senior Associate

Gavin #1

Gavin Pritchard is a transit planner and designer. He assists on projects through map-making, policy analysis, facilitation, and network planning. Gavin holds an Bachelor’s of Science in Community Development with a focus on land-use and housing from Portland State University, and a Master of Science in Community and Regional Planning specializing in transportation from University of Texas: Austin. His professional interests lie in how current right-of-way design emerged, the ways in which data collection and community interaction can better capture desired uses, and in translating this information into design that integrates local community values into larger systems.




PJ Houser, Senior Associate

PJ Houser JWA Associate

PJ Houser is a transit analyst and cartographer. She provides GIS analysis, graphic design and cartography, website development, Title VI compliance, and network design services for JWA clients, including Dublin, San Jose, and Indianapolis.

PJ contributes a strong and proven ability to use graphic design to illuminate complex data relationships underlying public transit service. She helps JWA clients see patterns and trends in their own data, providing them with the clear, relevant information upon which the JWA approach to transit network design is based.




Álvaro Caviedes, Senior Associate

Álvaro Caviedes is a transit planner and data analyst at Jarrett Walker + Associates. He brings to the organization his experience in urban planning, social equity, statistical and spatial analysis, cartography, and research.  Álvaro pursued a dual master’s degree in Urban Planning and Civil Engineering at Portland State University, where he focused on active transportation and accessibility. His interests lie on the social contexts of transportation systems and the ways in which data analysis and community engagement can help uncover people’s needs.




Ricky Angueira, Senior Associate

Ricky Angueira is a transit planner and an urbanist. He brings skills in multimodal planning, transit network design, policy analysis, community engagement, data analysis, and cartography. He focuses on communicating complex information through illustrative graphics and clear conversations. Ricky has helped cities make decisions about transit in both English and Spanish.

Ricky holds two master’s degrees in transportation engineering and urban planning. He has experience in Puerto Rico, the United States, and Spain in projects including transit network design, multimodal network analysis, land use planning, transit-oriented development, and strategic planning. Ricky is based in the Washington, DC area.

Mihir Bhosale, Senior Associate

Mihir Bhosale is a transit data analyst and planner at JWA’s Washington, DC area office. He contributes to tasks relating to deriving insights from the varied data sources available with transit agencies and also assists with the firm’s network planning, outreach, and cartography efforts. Mihir holds a Master’s degree in Transportation from Massachusetts Institute of Technology, where he was a part of Transit Lab. There, his research focused on planning transit alternatives during maintenance-related shutdowns in the MBTA heavy rail network by utilizing the agency’s extensive automated data sources.



Shreya Jain, Associate

Shreya Jain is a transit analyst and planner with Jarrett Walker + Associates. She brings skills in community outreach and engagement, data analysis, cartography, and project coordination. She has worked as part of a Complete Streets team that was involved in a range of projects including bicycle, pedestrian, and transit.

Shreya is a graduate of Portland State University where she received a BS in Environmental Science and a Master’s degree in Urban & Regional Planning. She is very involved with the bettering of her community and has participated in many service and leadership groups. A few of these groups focused on walkability and pedestrian infrastructure around the Portland Metro Area.



Jason Adle, Associate

Jason Adle is a transit analyst and planner with Jarrett Walker +Associates. He brings skills in public outreach and engagement, analysis and technical writing, cartography, and transit planning. He has worked on a team completing a long-range regional transportation strategy, where he interpreted public engagement data to help understand what people value most in their transportation network.

Jason graduated from the University of British Columbia with a Bachelor’s degree, where he Majored in Human Geography and Minored in Urban Studies. While in school, he volunteered with groups that were aimed at planning and public outreach. He was also invited to join the Canadian Urban Transit Association (CUTA) Young Leaders Summit where he was able to help develop strategies for creating more equitable multimodal transportation systems with his peers and industry experts.


Leah Bollin, Associate

Leah Bollin is a transit analyst and planner with Jarrett Walker + Associates. She assists on
projects related to data analysis, cartography, and network design. Leah graduated from the
University of Colorado with a Bachelor’s in Environmental Studies and Sociology with minors in Geography and Business. In addition, she received a GIS certificate from Portland Community College where she refined her analysis and map making skills. She finds her passion in making cities both safe and accessible for all and spends her time volunteering for programs that support this mission in Portland.




Liz Marchalonis, Associate

Headshot of Liz

Liz Marchalonis started her career in transit as an intern with Jarrett Walker + Associates and has now fully joined the team as an analyst. After more than a decade working in architecture, having earned a B.Arch from the University of Arizona College of Architecture, Liz decided to broaden her abilities in spatial analysis and mapping and pursued a GIS certificate from Portland Community College. She currently assists the firm in cartography, data analysis and network design and brings her experience working on large interdisciplinary projects. She is excited to be able to contribute her efforts towards improving and promoting public transportation.

Liz also lends her support to Portland’s dance and performance arts communities. Being a dancer from a young age has fostered her sense of appreciation for spaces dedicated to human movement, underscoring the significance of natural and built placemaking. Just as dance describes physical expression, she finds parallels in representing geography through cartography and buildings through drawing, each practice allowing one to gain much better insight into and the ability to tell complex stories about our surroundings.

Alex Boccon-Gibod, Associate

Alex Headshot

Alex Boccon-Gibod is a transit planner and cartographer at JWA’s Portland office. With experience at transit agencies, design firms, and in academic research, he brings a skillset and passion lying at the intersection of transportation planning, visual communication, and urban design. Through his work on public transit systems, he is committed to centering urgent goals such as decarbonization, equitable access to opportunity, and resilience.

Alex holds a Bachelor’s degree in Planning, a Bachelor’s degree in Art & Design, and a Master’s degree in City Planning from the Massachusetts Institute of Technology where he assisted on numerous transportation- and planning-related research projects. Most recently, he has gained experience redesigning New York’s subway and bus maps for the Metropolitan Transportation Authority.