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    Sara Tollefson

    Director of Impact


    Sara Tollefson develops strategy for, and oversees the implementation, of impact monitoring, evaluation, and reporting at D-Rev to help the global health technology nonprofit assess its progress and improve its effectiveness. Her favorite part of this role is communicating results through clear and compelling data visualizations. Before joining D-Rev, Tollefson practiced as a lawyer in New York City, including at the Legal Aid Society’s Community Development Program and as a local organizer of an effort to engage the Liberian diaspora population in the Liberian Truth and Reconciliation Commission process. She also has worked at a variety of nonprofits in the United States and abroad.


    Theresa Madeira

    Theresa Madeira

    Director of Marketing & Patron Loyalty

    The California Symphony

    Theresa Madeira has more than 20 years of experience in marketing and customer engagement and retention. She worked at companies including the Financial Times and Pandora before joining the symphony in 2017 to oversee sales and development. In this role, Madeira helps move customers step by step on a journey from ticket-buyer to subscriber to donor. She uses a targeted, data-driven approach to coordinate outreach on many communication channels. All of the development campaigns she has run for the symphony have exceeded their goals. During her first year at the organization, ticket sales increased by 16 percent from the previous year, and subscriptions rose by 14 percent.


    Lisa Schohl

    Lisa Schohl

    Editor, Online Learning

    Chronicle of Philanthropy

    Lisa Schohl helps produce the Chronicle's webinar series and writes and edits how-to articles on philanthropy.com. Before joining the Chronicle, she worked in nonprofit communications and management. Most recently, she led Spanish-language communication strategy at Polaris, a nonprofit working to end human trafficking. She also worked as a freelance reporter for outlets including the Knoxville News Sentinel.