Brenna Callahan grew up with three sisters — essentially, in a house full of women. She interned and volunteered with several nonprofits focused on women's and girls' health while in college, including Planned Parenthood League of Massachusetts and Peer Health Exchange. She earned her degree in English from Boston College with a minor in Women's and Gender Studies in 2013. She later worked in both development and operations at the Boys & Girls Clubs of Boston, managing agency-wide events such as a large-scale holiday gift program and career forum for teens across the City.

As Policy and Communications Manager for MOWA, Brenna oversees all department communications, including the Work Smart in Boston salary negotiation program. She also assists the Boston Women's Workforce Council and Women Entrepreneurs Boston (WE BOS) with a variety of communications, programming, and policy needs. She also leads MOWA’s economic equity policy portfolio, which includes closing the gender pay gaps and addressing childcare needs.

Brenna believes collaboration, education, and diversity are at the heart of serving the public, and her work in the Mayor's Office of Women's Advancement is focused on bringing those principles together to inform policy. Brenna received her Master of Public Administration from Suffolk University and is a member of the Young Friends of PPLM. She lives in East Boston.