About Us

Whitestar Group

One of California’s premier investigation companies, is comprised primarily of former law enforcement detectives and administrators. Our staff members have the resources and expertise to provide thorough and reliable investigative services to law firms, insurance companies, corporations, financial institutions and employers throughout the state. With the understanding that information is an immeasurable asset to many of our clients, Whitestar has developed relationships with like firms throughout the US and several European Countries. No matter where the assignments take us, Whitestar investigators will be able to accommodate any request and guarantee the highest level of service available in the industry.


Mark Adams, CEO

Before entering the private sector, Mark was employed as a full time sworn officer from 1989 to 2003 and part-time again from 2005 through 2018. During his law enforcement career, he was assigned to both Patrol and the Investigations Division. He received specialized training and work experience in many areas, including Violent Crimes Investigation, Forgery/Fraud, Property Crimes, Crimes against Persons, and Narcotics Investigations. He was also assigned to the Sonoma County Narcotics Task Force as an undercover narcotics officer for several years. During that time, he received extensive training and experience in the field of narcotics and possession for sale cases. This assignment also allowed Mark to receive advanced training and practical field experience in surveillance operations. Mark and his team logged thousands of hours performing all types of surveillance, including static, mobile, aerial, and electronic. Mark is a court-certified expert witness in the Sonoma, Mendocino, and Marin County Superior Courts for both narcotics matters and workplace employment investigations.

Mark holds a Bachelor of Arts degree in Business Management from St. Mary’s College, Moraga.

In 1996, Mark attended the DOJ sponsored Robert Presley Institute of Criminal Investigations and received his advanced certificate in criminal investigations.

In 2009, Mark was accredited by the Association of Certified Fraud Examiners as a Certified Fraud Examiner (CFE) after passing both the stringent application and testing process.

In 2013, Mark refocused his investigative career path to become a specialist in public and private sector workplace investigations involving complex discrimination and harassment claims. Mark is a member of AWI – Association of Workplace Investigators.