Susan Colby is a partner and head of Bridgespan's San Francisco office. She works with foundations and has consulted for a variety of nonprofit organizations, from smaller, local community-based organizations to large national agencies. She has coauthored several articles based on her consulting work, including “Zeroing in on Impact,” with Nan Stone and Paul Carttar, which appeared in the fall 2004 edition of the Stanford Social Innovation Review. Colby joined the Bridgespan Group from Pharmacia (previously Monsanto), where she served as co-president of the Sustainable Development Sector, a for-profit business development initiative that developed economically, environmentally, and socially viable solutions to promote agricultural sustainability. Prior to Monsanto, she spent 10 years at McKinsey & Company, where she cofounded and co-led the North American Environment Practice, serving clients in the areas of environmental management and strategy. At McKinsey, she also served foundations and environmental nonprofits on a pro bono basis and worked with clients in the financial, consumer goods, and energy industries. Colby began her consulting career at Bain & Company, after receiving her BA from American University cum laude. She then went on to earn her MBA from Stanford University's Graduate School of Business.