Description Cornerstone Concilium, Inc. is a privately held minority-owned professional consulting firm formed in 1986 to provide engineering and management consulting services within the facilities, transportation, and technology industries. We have offices in San Francisco and Washington D.C. to support out team of 50 professionals. Responding to the increasingly complex and rapidly changing nature of the business environment, we have established a single source organization to provide flexible and responsive services specifically suited to individual client needs for both privately and publicly funded projects.