About Us
Decades of Dedication, a Legacy of Confidence!
Investigative Resources Inc, established in 1982, provides investigative services to Denver and Colorado with a national network of information sources and contacts. Under the direction of Anthony DiVirgilio, a retired Police Division Commander with over 40 years of investigative experience, and Paige Dreier, an experienced criminal defense, and civil litigation investigator, the company is tailored to serve legal professionals, corporations, and business entities. Beyond the courtroom, we extend our expertise to conduct nationwide background and asset investigations for various professionals. Our dedication to upholding the highest standards and our extensive network and seasoned expertise make Investigative Resources Inc a trusted partner for legal and business professionals nationwide. With a legacy spanning over four decades, we continue to set benchmarks in investigative excellence, driven by a mission to deliver results with integrity, discretion, and professionalism!
Richard Hill2022-05-13I have worked with Tony and Investigative Resources for over 40 years and have always received extremely valuable insights about my cases by collaborating with them. Moreover, they have provided referrals to professionals in other fields who have been similarly helpful in developing cases. In contrast, my experience using investigators in other states has been inconsistent, which is why Investigative Resources will always be my first call when I am looking for investigative services. I cannot recommend the firm highly enough.
Jeralyn Merritt2019-07-02Tony has been my "go to" investigator for complex federal cases for more than 20 years. He is well-versed in all aspects of the criminal case and provides invaluable assistance at all stages, from bond hearings to managment of e-discovery, conducting witness interviews, locating the right expert witness for my issue, challenging wiretap and search warrant affidavits, developing impeachment evidence on the government's witnesses for trial, and if need be, gathering mitigation evidence for sentencing. Tony also creates an excellent rapport with my clients and they trust him. His top-notch staff of investigators each have expertise in critical areas. They work as a team and together they provide an unrivaled level of support to the criminal defense lawyer. I highly recommend them to any lawyer needing an investigator in any case, state or federal, whether it's challenging a seemingly simple traffic stop or digging deeply into a complex drug or fraud case.
Dianne Noah2019-07-02Our law firm has used Tony’s services for many years. We know we can count on him to be thorough and extremely knowledgeable which makes him an asset on any case . He has an extensive knowledge of the law and we know that he will do everything he can to help our clients.
Anthony DiVirgilio
Anthony DiVirgilio is the president and co-founder of Investigative Resources, Inc. He has been with IRI since 1983. Mr. DiVirgilio is a retired Police Division Commander, holds a Bachelor’s Degree in Sociology and Police Science and has over 40 years of experience in investigations. These investigations include the defense of federal white collar fraud cases involving banking, securities, healthcare and environmental matters; as well as numerous (Federal Drug Task Force) Title III Wiretap, CCE and RICO cases. Additionally, Mr. DiVirgilio has been the lead defense investigator in several high profile homicide and sexual assault cases.
Paige Dreier
Paige Dreier received her Bachelor’s Degree in criminal justice from Colorado State University in May 2017. While in undergraduate school Paige held an internship with the Office of the Colorado State Public Defender in Fort Collins and worked as an investigator. Currently, Paige is an investigator with IRI conducting Sexual Assault & Title IX investigations, witness interviews, background investigations, asset searches, witness location, and the organization and analysis of discovery in complex cases.
Jessica White
Jessica received her Bachelor’s degree in psychology and sociology from the University of Colorado, Boulder in December 2021 and her Master’s Degree in criminal justice from the University of
Colorado, Denver in May 2024. While in her undergraduate, Jessica held an internship with the Office of the Colorado State Public Defender in Brighton and worked as an investigator. Jessica is an investigator with IRI conducting witness interviews, background investigations, asset searches, personal injury accident investigations, and records retrieval.
Michael E. Martinez
Mike has extensive experience in corrections, including jails, prisons and community-based corrections. Mike’s career in corrections includes employment as a deputy sheriff with the Denver Sheriff’s Department, an adult probation officer with the Fourth Judicial District Probation Department, Colorado Springs, Colorado, and as a United States Probation Officer for the District of Colorado.
In his capacity as a United States Probation officer, Mike served as a line officer, the District’s Special Offender Specialist, Supervisor and for six and a half years prior to his retirement in December 2000, as the Deputy Chief. During his career as a Supervisor and Deputy Chief, Mike worked closely with the Federal Bureau of Prison and state and local correctional officials.
Mike taught community and institutional-based corrections courses at Metropolitan State College of Denver, Administration of Community Corrections as an Honorarium Instructor for the Graduate School of Public Affairs, University of Colorado at Colorado Springs, and Director of the Bachelor of Arts in Criminal Justice program at UCCS as a Senior Instructor.
Mike has been with Investigative Resources since March of 2001. During that time he has served as a consultant and investigator for attorneys in the evaluation and preparation of pretrial and presentence investigation reports on the state and federal level. Mike has served as an advisory witness for attorneys appearing before the federal court on issues related to the investigation and supervision of federal offenders and application of advisory federal sentencing guidelines.
Richard Vaccaro
Rich has an extensive background in the court system, community-based corrections, & investigations. After receiving his Bachelor’s Degree in Criminal Justice from the State University of New York at Albany in 1989,
Richard was hired as the youngest Federal Probation Officer at the time by the United States Courts in the Eastern District of New York, conducting presentence investigations and supervising a caseload of federal offenders on probation & parole.
During his tenure in the EDNY Rich received a Masters Degree in Criminal Justice from John Jay College in New York City. Shortly after transferring to the District of Colorado, Richard was promoted to Supervising Probation Officer, and held that position for ten years before retiring in 2014. In addition to his tenure with IRI since 2016, as an investigator and a sentencing consultant, Richard has embarked on a second career in criminal justice-focused education. This has included working as an adjunct instructor at Arapahoe Community College and teaching high school students in Arapahoe, Denver, and Douglas counties.
Faq
Yes, we offer comprehensive nationwide background checks that can include criminal records, employment history, educational verification, and other pertinent personal information as required.
We adhere to strict confidentiality and privacy standards, ensuring all investigations are conducted discreetly to protect our clients' information and the investigation's integrity.
Our reports are detailed, including evidence collected, witness statements, and analysis, and are presented clearly and professionally to aid in legal proceedings or decision-making.