Meet the Team

Walk SF’s work is powered by our passionate staff, Board of Directors, Advisory Council, volunteers, and members.

Learn more about our:

• Staff
• Board of Directors
• Advisory Council

Become a member, explore volunteer opportunities, or check out job and internship opportunities.

Staff & Interns

Kathleen Brennan, Development Director
pronouns: she/her

Kathleen oversees fundraising for Walk San Francisco. She has over 15 years of fundraising experience, focused on supporting San Francisco nonprofits. Most recently, she was Development Director at Voice of Witness and has also worked in development at SFMOMA and the Fine Arts Museums of San Francisco.

Kathleen is a Bay Area native who loves spending her free time hiking and exploring the streets of San Francisco with her dog. Favorite places to walk include Golden Gate Park, the hidden stairways of Bernal Heights, and any trail that leads to a view of the ocean.

Contact Kathleen at kathleen@walksf.org.

Guy Joaquin, Development & Events Manager
pronouns: he/him

Guy manages Walk San Francisco’s membership and donors, as well as walking events. Prior to joining Walk San Francisco, Guy served as a project manager for a career transition and relocation assistance company.

Guy feels most at home when outside walking. He began his walking “career” 10 years ago by completing the 500-mile Camino de Santiago pilgrimage across northern Spain, but nowadays you’ll most likely find him on a local route accessible by public transportation. In fact, Guy is the author of BARTable Walks, a series of BART station-to-station walking tours that highlight fun and interesting spots along the way.

Contact Guy at guy@walksf.org or call at 415.431.9255.

Marta Lindsey, Communications Director
pronouns: she/her

Marta oversees Walk San Francisco’s communications plus is deeply involved in the organization’s policy and advocacy work. Prior to joining Walk SF, Marta served as the communications director at TransForm, as well as the interim communications director at the San Francisco Bicycle Coalition. As a communications consultant, Marta worked with a range of nonprofits focused on transportation, land use, social justice, and sustainability.

Marta has lived in San Francisco for almost 20 years. She considers the fact that she and her family can walk almost everywhere they need to go a key piece of her happiness. She’s obsessed with Golden Gate Park and is on JFK Promenade almost every day. She’s also the author of the children’s book Golden Gate Park, An A to Z Adventure and the forthcoming book Discovering Golden Gate Park: A Local’s Guide. 

Contact Marta at marta@walksf.org or call at 415.234.0347.

Malena Mackey Cabada, Community Engagement Manager
pronouns: she/her

Malena assists the Safe Routes to School initiative and supports any form of car-free transportation. Prior to joining Walk San Francisco, she worked as an apprentice for an environmental non-profit that does restoration and community programming in Bayview-Hunters Point.

Malena has a B.S. in Environmental Studies with a concentration in natural resource management and conservation from SF State. She also holds a seal of biliteracy in Spanish and is pursuing a certificate in geographical information studies. Being outdoors and traveling are her main passions. She also loves to bake, camp, and take walks.

Contact Malena at malena@walksf.org.

Jodie Medeiros, Executive Director
pronouns: she/her

Jodie is responsible for leading Walk San Francisco’s strategic work. She has a long and successful history leading communications, fundraising, and advocacy at urban livability, active transportation, and poverty alleviation nonprofits.

Prior to joining Walk SF, Jodie was Deputy Director at the SF Housing Action Coalition, where her work was critical in passing Home SF, a policy to incentivize building more affordable and family-friendly housing in San Francisco. During her eight-year tenure as Development Director at the San Francisco Bicycle Coalition, she helped grow the organization from four to seventeen staff and collaborated on the Great Streets Project, which led to Sunday Streets and the now-thriving parklet program. Jodie earned a Bachelor of Arts in History from Clark University.

Contact Jodie at jodie@walksf.org.

Fiona Yim, Communications & Marketing Manager
pronouns: she/they/她

Fiona’s work is all about reaching more people in more ways to grow the safe streets movement. Before joining Walk SF, she was a San Francisco Fellow in SFMTA’s Accessible Services team. Fiona holds a B.A. in Urban Studies from UC Berkeley, where she served as a board member for Telegraph for People, a student-led advocacy group focused on safe streets and active transportation.

Growing up in the Excelsior and Parkside neighborhoods, Fiona spent much of her time walking and riding transit around San Francisco. Her favorite destinations include Chinatown, Clement Street, and Dolores Park. She believes walkable neighborhoods are essential to building resilient and sustainable cities. Outside of work, Fiona enjoys printmaking, board games, and rock concerts. She is also a member of BART’s Link21 Equity Advisory Committee.

Contact Fiona at fiona@walksf.org.

Board of Directors

Learn more about Board service.