Blackbaud has acquired WhippleHill Communications, a company that services K-12 private schools. The Charleston, S.C.-based nonprofit vendor is paying $35 million in cash for all shares of WhippleHill, which is based in New Hampshire. The acquired company, which was founded in 1988, will be merged with an existing Blackbaud group that serves the private school market and will be managed by WhippleHill president and founder, Travis Warren, as part of Blackaud's General Market Business Unit.