scott mullen

Transportation Demand Management Director

Scott Mullen joined the ABC team as Transportation Demand Management Director in summer 2020. He is responsible for managing multiple Transportation Management Associations (TMAs) that collectively serve over 100 member organizations as well as leading policy research and advocacy related to TDM issues such as municipal regulations, zoning, employer transportation benefits, and transit fare policy. His goal is to build innovative, sustainable TDM policies of the future, now.

For the last two decades, Mully has focused on promoting and delivering solutions that help individuals and institutions ‘think outside the car’. His approach to modeshift has spanned the fields of journalism, startup operations, business development, advocacy, strategy, and government relations. A shared economy pioneer, Mully was an early employee at several groundbreaking companies and has had a front row seat in the formation and growth of three transportation sectors: carsharing at Zipcar, bikesharing at Hubway (now BlueBike), and micromobility at Lime. 

Mully holds a B.A. in Philosophy from Merrimack College and feeds his love of learning with frequent courses through edX. 


Project Director of TMA Innovation & Engagement 

Marissa Rivera joined A Better City in February 2020, and is our Project Director of TMA Innovation & Engagement. In her role, Marissa oversees services and programming for two TMAs serving over 100 member organizations in neighborhoods across the city. With over ten years of experience in the public and nonprofit sectors, she brings a robust set of skills related to planning, delivering, and evaluating programming designed to engage and deliver value to community stakeholders.

Prior to joining A Better City, Marissa oversaw special service programs and partnership initiatives at Cradles to Crayons – Boston. During her tenure there, she deepened service partner relationships and strengthened program processes to achieve a 20% increase in service volume through one flagship initiative.

Earlier in her career, Marissa established and strengthened processes related to procurement contract documentation, small vendor invoicing, and development-related travel at Boston University. A returned Peace Corps volunteer, Marissa also served in China as a University English Teaching Volunteer where she taught regular classes and established a hiking group for her students.

Marissa holds an MBA in Public and Nonprofit Management from Boston University’s Questrom School of Business as well as a B.A. in Comparative Literature from The Colorado College. A longtime bike commuter, she is excited to collaborate with our member organizations to mobilize commuter networks in favor of sustainable transportation choices. 

christine yi

TMA Coordinator & Spatial Data Analyst

Christine Yi joined A Better City in October of 2020, and is our TMA Coordinator & Spatial Data Analyst. In her role, Christine supports commuter program delivery to member organizations served by Allston-Brighton TMA and Allston Brighton TMA. She cultivates outreach and communication strategies for commuter programming, designs and develops TMA promotions and events, and leads TDM research and project data visualizations. 

Christine holds a B.A. in Sociology and Economics from Wellesley College.