was founded in 1978 in San Francisco, California by Mr. Derish, who at the time was the youngest licensed private investigator in the state’s history. The firm has worked for most major law firms and financial institutions in Northern California and their current clientele spans the globe. In addition to San Francisco, the firm has offices in Oregon and Arizona. While Mr. Derish handles international clients, his partner, Mary Nikas, is in charge of U.S. operations. She has been a licensed investigator for 20 years and comes from a background in the real estate and financial services industry.
is the regional director for Central and South America for the Council of International Investigators, a prestigious international association with members in more than 50 countries. He is also a lifetime member of the World Association of Detectives, the largest and oldest association in the world. He counts amongst his colleagues some of the most influential and important private investigators in the world.
Council of International Investigators (CII)
World Association of Detectives Lifetime Member (WAD)
California Association of Licensed Investigators (CALI)
Oregon Association of Licensed Investigators (OALI)
Association of Certified Fraud Examiners (ACFE)
Costa Rica I.D.: 3-101-239-587
California P.I. No.: 12656
Oregon P.I. No.: 33709