W.K. Kellogg Foundation Invests in BoardSource’s Work to Strengthen the Nonprofit Sector Posted August 6, 2015 & filed under Press Releases. Washington, D.C. – BoardSource recently received a two-year, $300,000 grant from the W.K. Kellogg Foundation (WKKF) for general operating support, which will fund the organization’s work to strengthen nonprofit board performance and leadership. Read the full press release.