Private Investigators in Pasadena, CA
Pasadena sits at an interesting crossroads of old money and new tech, quiet residential streets around the Rose Bowl and Caltech, and a courthouse that handles a steady stream of family law, probate, and civil disputes for the entire San Gabriel Valley. Cases here tend to move through tight-knit neighborhoods where discretion isn’t just something nice-to-have, rather it’s the whole job.
Kay & Associates has worked cases in and around Pasadena for decades, from Old Town to South Pasadena, San Marino, Altadena, and La Cañada Flintridge. Our office is centrally located in Beverly Hills, roughly a 25–30 minute drive from most Pasadena addresses, and we schedule in-person meetings by appointment so your visit stays private from the moment you walk in.
Common Cases We Handle for Pasadena Clients
Businesses & Law Firms
Pasadena’s mix of established family businesses, biotech and engineering firms near Caltech and JPL, and small professional practices generates its own share of investigative needs: employee misconduct, asset searches, financial fraud, and background investigations ahead of a hire, partnership, or acquisition.
Individuals & Families
Suspected infidelity, divorce-related investigations, child custody disputes, missing family members, and background checks on a new partner, tenant, or caregiver. Many Pasadena and San Marino families come to us during a custody matter working its way through the local family courts, where documented, admissible surveillance can materially change an outcome.
Services Available Throughout Pasadena
Why Clients Choose Kay & Associates Investigations
Clients choose Kay & Associates because we combine local knowledge, investigative experience, and discretion. Since 1992, we have handled complex investigations throughout Southern California and beyond.
What sets our firm apart:
- Licensed California private investigators since 1992

Andy Kay is the founder of Kay and Associates Investigations
- Experience handling high-profile and sensitive cases
- Extensive surveillance experience
- Professional reporting and evidence documentation
- Fast response times
- Discreet and confidential investigations
- Experience working with attorneys and court-related matters
How May We Help You?
Time is of the essence, especially when it comes to investigations. Each moment, every day, determines the success of a case. Our clients chose us because we move quickly, quietly, and steadfast, ensuring their investigative needs are addressed with the utmost professionalism and expertise.
The first step is to call us or email us, and to get your case started as soon as possible. Don’t waste another moment trying to find the right investigator for your case. We are the best, simply stated, and our decades of experience and stellar reputation reinforce this fact.
