Staff Members

Ellen Greenberg
Deputy Director of Sustainability

Ellen Greenberg has over 30 years’ experience working with cities, transportation agencies and non-governmental organizations to guide development, conservation and transportation decisions. Before joining the Caltrans Sustainability Program, Greenberg was a principal at Arup, an independent design, planning and engineering firm, where she worked since 2010. Greenberg served in the leadership of Arup’s planning and infrastructure groups in San Francisco. During her time at Arup, she worked with transportation agencies including LA Metro, the Maricopa County (Arizona) Association of Governments, Translink (Vancouver Region) and the SF Bay Area Metropolitan Transportation Commission.

Ellen was lead author of Caltrans’ Smart Mobility Framework, which was initiated with support from the U.S. EPA Office of Sustainable Communities. Other areas of work with the EPA office have included urban eco-districts, reuse of obsolete shopping malls and sustainable street design. She also was appointed as the first visiting practitioner at the University of California, Davis National Center for Sustainable Transportation.

Joanne Valdivia, Administrative Assistant

(916) 654-4852

Marlon Regisford
Sustainability Projects Manager

Sustainability Supervising Planner

Marlon received his BS from Cal Poly Pomona in Urban and Regional Planning and received his MS from San Jose State University in Transportation Management. Marlon started in 2006 in District 12 as a Transportation Planner in the IGR/CEQA Branch, specializing in CEQA environmental impact analyses, as well as in the development of transportation demand management and mitigation strategies. Marlon prepared Transportation Concept Reports as part of the System Planning Branch and served as the D12 Bicycle and Pedestrian coordinator, as well as the District Grant Coordinator, managing the Sustainable Transportation Planning Grant Program (STPG).

Most recently, Marlon served as the D12 System Planning Branch Chief, overseeing the Active Transportation, Freight, Modeling/Forecasting, STPG, Air Quality, Park & Ride and Rideshare functions.

Marlon’s background is a combination of urban design and transportation planning with a multi-modal focus, and he is a proponent of environmental justice and sustainable communities. Marlon currently serves as a Diversity Chair for the American Planning Association, CA Chapter, Orange County Section.  In his spare time, Marlon enjoys hobbies such as bicycling, playing and watching sports (especially soccer), exploring nature, and spending time with family. He is a self-proclaimed “exceptional” cook who aspires to live the food critic lifestyle of traveling and eating!

(916) 879-7521

Tony Dang, AICP
Sustainability Program Manager

Sustainability Supervising Planner

Tony joins the Caltrans' Sustainability team with over a decade of experience in the non-profit sector working at the intersection of transportation, sustainability, and equity to create more vibrant, livable, and just communities. Prior to joining Caltrans, Tony served as the Executive Director of California Walks where he oversaw the organization's policy advocacy, community engagement programs, and technical assistance services. At Cal Walks, Tony worked alongside dozens of communities across California to secure millions of dollars to implement their community-driven vision for active transportation.

Tony is a member of the American Institute of Certified Planners, a certified instructor of the Safe Routes to School National Course, and a League of American Bicyclists Certified Instructor (LCI # 6010). Tony holds a BA from Stanford University in Comparative Studies in Race & Ethnicity.

(916) 926-1494

Kim Epperson

Staff Services Manager I

Kim Epperson is currently Recourse Manager for the Sustainability Program in the Director’s Office. Kim started her Caltrans career in 2000 as a Dispatcher-Clerk at the Kingvale Communication Center. Kim later went to work as a Dispatcher-Clerk at the District 3 Regional Transportation Management Center eventually becoming the Dispatcher-Clerk Supervisor at the same location. In 2010 she accepted the position of Caltrans Regional Administrative Officer in the Sunrise Region Office in District 3. The beginning of 2014 Kim shifted her career outside of Maintenance and joined Headquarters Project Management team as Resource Manager over the Division of Construction. Kim joined the Sustainability team the end of October 2018.

(916) 654-5772

Anika Jesi

Senior Transportation Planner

Anika Jesi joins the Sustainability Program as a Senior Transportation Planner working primarily on policies and processes to help integrate active transportation into the Department and allow for the development of more bicycle and pedestrian facilities on the State Highway System. Prior to joining the Sustainability team, Anika was in the Smart Mobility & Active Transportation branch in the Division of Transportation Planning, where she worked on projects such as development of a Smart Mobility How-to Guide and Complete Streets implementation. Originally, Anika hails from San Francisco where she began her career at the Metropolitan Transportation Commission managing the Freeway Service Patrol program. Outside of work, Anika serves as a Commissioner on the Sacramento Active Transportation Commission and as Vice President of her local neighborhood association. In her free time, she enjoys gardening, house projects, tennis, and hanging out with her husband and cat. Anika holds a Bachelor of Arts in Environmental Studies & Urban Sustainability from Seattle University.

(916) 653-0507

Jannette Ramirez

Senior Transportation Planner

Jannette Ramirez is the ZEV Program Lead in the Office of Sustainability. She coordinates the implementation of Caltrans ZEV Action Plan and Caltrans five-part ZEV program: workplace, fleet, public, freight and partnerships.

She has over close to seven years of Caltrans experience and began her career with the Caltrans Office of Project and Program Planning at Headquarters. Her first job out of college as a Transportation Planner entailed tracking and managing the quarterly progress of statewide Project Initiation Documents (PIDs) and represented the Office in the Department’s efforts on incorporating complete streets into the SHOPP. She joined the Caltrans District 4 LD-IGR team in 2016 where she wrote comment letters following SB 743 guidance for CEQA projects affecting the State Transportation Network.

Jannette graduated from the University of California, Davis with a Bachelor of Science in Environmental Policy and Planning Analysis and a Bachelor of Arts in Comparative Literature. She had the opportunity to study abroad in Madrid for a quarter where she took Spanish Literature courses in her native tongue.

(916) 653-4577

Abigail Jackson, AICP

Associate Transportation Planner

Abigail leads Sustainability Program research efforts on congestion pricing and other vehicle miles traveled reduction strategies, and their impacts on social equity, the freight sector and achieving state climate and housing goals. Primarily, Abigail supports the SB 743 Implementation team and has worked on projects such as the California Freight Mobility Plan 2020 Update. She also facilitates California’s participation in the international Transportation Decarbonization Alliance, among other planning and policy-related duties.

Prior to joining Caltrans, Abigail worked as a regional economic development planner and as a consultant (LSA) on the Fresno-to-Bakersfield California High Speed Rail Project conducting CEQA/NEPA analyses. She was also a community organizer for the “Building Food Justice in South Madison” partnership and worked on active transportation policy at the State of Wisconsin’s Bureau of Public Health.

Abigail received her Master of Science degree in Urban and Regional Planning from the University of Wisconsin-Madison and a Bachelor of Arts from UW-Madison in international studies of the global commons and environmental policy. In her spare time, Abby loves playing ultimate frisbee, camping, and serving as Vice Chair of her local neighborhood association.

(916) 653-9367

Ali Doerr

Transportation Planner

Ali Doerr is a Transportation Planner in the Sustainability Program. Ali staffs the California Walk Bike Technical Advisory Committee, Complete Streets Center of Excellence and a variety of other projects related to the mitigation of greenhouse gas emissions within the Department.

Prior to joining the Sustainability Program Ali worked in the Climate Change Branch at Caltrans and oversaw the Adaptation Planning Grant Program. In that role she assisted grant recipients and worked with stakeholders to bridge the gap between transportation investments and climate change effects in their region. Ali also worked for the City of Eugene as an intern within the Transportation Options office to plan and implement community support around active transportation.

Ali holds a Bachelor’s of Science in Planning, Public Policy and Management from the University of Oregon.

(916) 653-2580

Korinne Tarien

Transportation Planner

(916) 651-5722