Welcome to Excell Investigations, we provide competitively-priced professional private investigation services throughout Southern California. In business since 1992, we have decades of experience providing the Greater Los Angeles area with high-quality investigation services, including surveillance, locating, skip tracing, process serving, background check, polygraph testing, asset search, record search, and more. All of these services are provided by highly experienced and fully qualified private investigators/detectives and process servers, who are all very knowledgeable, discreet, and detail oriented. With each and every case, our investigators focus their efforts on each client’s specific goals. With our highly skilled and dependable team, competitive rates, and 24/7 availability, it’s no wonder that we have 1,000s of satisfied clients and an A+ rating with the Better Business Bureau.

Private Investigator Serving Downey, Los Angeles, Long Beach, Pasadena,
Tustin, and the Surrounding Area

At Excell Investigations, our private investigators are licensed by the California Bureau of Security and Investigative Services (BSIS). While all of them have years of direct, on-the-job experience, some of our investigators also have past work experience with law enforcement, the military, and/or state or federal investigative departments. Whether we’re investigating marital infidelity for a concerned spouse, conducting covert surveillance for a business, or serving court documents on behalf of a law firm, our investigative agency aims to deliver the highest level of customer service. We take the time to tailor our investigative programs to accommodate a wide range of needs, concerns, deadlines, and budgets. We rely on the best investigative technology and techniques, and comply with the industry’s leading standards for surveillance, locating, records search, and process service. Additionally, because we have access to an extensive national records database and large network of licensed investigators, we also have the capacity to pursue some cases that go well beyond Los Angeles.


Recovering fingerprints, even partial fingerprints, from a crime scene is essential to a criminal investigation.

Excell Investigations is fully licensed, bonded, and insured, and available 24 hours a day, 7 days a week to clients throughout Long Beach, Downey, Los Angeles, Pasadena, Cerritos, Paramount, and beyond. Our full-service investigation firm is also a member of the California Association of Licensed Investigators (CALI); Professional Investigators of California (PICA); National Association of Investigative Specialists (NAIS); International Private Investigators Union (IPIU); and World Association of Detectives (WAD). We offer free consultations over the phone and at our offices. Alternatively, we can meet clients at an off-site location for a small fee. For surveillance investigations, we provide a comprehensive final written report with video or camera footage.


Click on our association logos to visit their websites.

Angi 2021 Super Service Award
Los Angeles IPIU Professionals
Lawmate America Innovation
Professional Investigators Association
Association of Excellence
WAD Certified Professionals
PInow.com Qualified Investigator
Excell Investigations Business Listing


Had an issue with an employee and relative stealing from the business called Excell Investigations and with 72hrs after signing a contract agreement ... had all the answers I needed and all the culprits where caught red handed thank you guys. If. I ever have to serve legal matters or any of my friends and family don Excell is who I am calling. The Best Professional Reliable Affordable

Ricardo C., Downey, CA Via Yelp Testimonial

View More Reviews

Worked with John on a very difficult private investigation case. These guys are truly experts and I was able to get what I needed quickly and cost effectively. They explained the process of what they were doing each step of the way and kept me updated constantly regarding the status of my case. Honestly if your looking for a professional and hard working PI, I wouldn't go anywhere else but Excell.

Jennette F., Huntington Beach, CA Via Yelp Testimonial

View More Reviews

I contacted Excel for information regarding these harassing ghost texts I was receiving. I spoke with John who was very helpful and informative. He also gave me 3 complementary phone number look ups. That was very generous of them. Thank you

Nancy R., Los Angeles, CA Via Yelp Testimonial

View More Reviews

Excell Investigations

treats every case with discretion, and every client with the utmost attention and professionalism.

We are extremely thorough and discreet, working tirelessly using proven techniques and equipment and only relying on what we can prove.

We keep your case confidential.
* Call for details

Recent Cases

Complex Skip Tracing Investigation

Excell Investigations recently had a case where a Michigan client was looking for his ex-sister-in-law. Our client’s brother had passed away and his wife ran off with their child. The paternal grandparents had custodial rights through the father’s will and they hired us to locate the woman who had an outstanding arrest warrant. After running a credit report, we learned that the woman recently ran a credit check to find an apartment in the Palm Springs, CA area. We sent a private investigator to visit the apartment complex and were able to verify the subject’s home address and provide this information to our client.