Ms. Harris is a founding member of the Fillmore Merchants and Neighborhood Collaborative, and the Fillmore and Japantown for Justice Coalition. Ms. Harris has served small businesses in her community for over a decade, both as a subcontractor with the City and County of San Francisco, and on a pro bono basis. Ms. Harris is currently contracted as the Corridor Manager by OEWD for the 2021-2022 fiscal year. Ms. Harris has supported merchants along the corridor like Bruno's Pizzeria, Sheba Piano Lounge, Miyako Old Fashion Ice Cream Shop, and Jazz’z Salon with marketing, loan and grant applications, one-on-one business consultations, credit card and POS set up, and advocacy.

Ms. Harris was previously contracted by OEWD to create and implement qualitative and quantitative surveys for Lower Fillmore merchants for the previous Merchants Association over 10 years ago. During the COVID-19 pandemic, Pia launched the Heritage Market, an online delivery platform to support Fillmore merchants with sales during this difficult time, and the Fillmore Marketplace, a bi-weekly market on O'Farrell and Fillmore Streets. The Fillmore Marketplace provided a location and sales opportunities for eight (8) Fillmore businesses.