As CBO, Callejon oversees activities designed to ensure that the GlobalGiving marketplace is valuable to players of all sizes, and that the website(s) they develop provide individual and institutional donors with a great experience. This includes development of corporate and other strategic partnerships, relationship management for major donors, and development of technology and infrastructure for globalgiving.org and over a dozen custom websites. Callejon also serves on the Board of GlobalGiving UK, Women's Funding Network, and the Non-Profit Village in Montgomery County, Maryland. She previously served nine years on the Board of the Washington Area Women's Foundation (three years as Chair) and six years on the board of Business for Social Responsibility. In a prior life, Callejon was a senior executive of Fannie Mae, having led the company's strategic planning, business development and international consulting efforts, and prior to 1996 ran the core business, including marketing, product development, customer technology and negotiated transactions. She holds a B.S. in Managerial Economics from UC Davis.