Rosen opened a private criminal law practice in Marin County in 1985. He specialized in criminal law and his practice has included federal crimes and death penalty cases. He holds the highest attorney rating of A.V. in Martindale-Hubbell. He has served as an adjunct professor of law teaching criminal law and procedure at Hastings College of the Law, and has served as faculty member and program chairman of the nationally recognized Hastings College of Trial Advocacy.

In 1996, Rosen joined with an established background and corporate security agency, the Doane Agency, to create a new firm in 1997, Employment Screening Resources® (ESR) – a division of a California Corporation – dedicated to promoting a safe and profitable workplace for both employers and employees. In 2003, that firm was rated as the top screening firm in the US in the first independent study of the industry in research report prepared by the Intellectual Capital Group, a division of HR.com.

Rosen has qualified and testified in the California, Florida, and Arkansas Superior Court as an employment screening expert on issues surrounding safe hiring and due diligence. In 2000, he testified as an expert on background screening on behalf of the plaintiff in a case where the jury awarded 9.3 million dollars to the family of a doctor murdered by a carpet cleaner who was hired without any background investigation.

Rosen was the chairperson of the steering committee that founded the PBSA, a professional trade organization for the screening industry, in 2003. He was also elected to the first board of directors and served as the co-chair in 2004. As a background screening expert, he has been quoted by USA Today, Businessweek, Reuters, Christian Science Monitor, HR Magazine, and numerous newspapers, web sites, and trade journals across the United States.

He is also creator of a comprehensive Online Safe Hiring Certification Course, and narrator of the training video “Safe Hiring: How You Can Avoid Bad Hires” by Kantola Productions. He has written numerous articles and whitepapers on the subject of employment screening and selects the annual ESR Top Ten Background Check Trends.

Rosen has authored a module of the Global HR Practitioner Handbook Volume 3 published by Global Immersion Press titled “Criminal History Screening of Global Job Applicants: Hidden Dangers Employers Should Know.” He co-authored the ‘International Employment Background Checks’ module in the Global HR Practitioner Handbook Volume 2 from Global Immersion Press.

Rosen has also been active in working on legislation in California. In 2002, he worked with the California legislature to amend AB 655, a law that adversely affected employers in the area of reference checks and hiring in California.  He continues to be involved in California legislation affecting employers.  He can be emailed at [email protected].