Guillermo Perez
Consultant Use of Force and Internal Affairs Investigations ExpertMore than four decades of investigative and law enforcement service across municipal, county, and federal law enforcement.
Conclusions that can withstand examination
Complex investigations require more than experience—they require the judgment to recognize what matters, follow the evidence, and reach conclusions that can withstand examination. Guillermo brings that perspective to The Advisory Bureau following more than four decades of investigative and law enforcement service.
His professional background spans municipal, county, and federal law enforcement, with assignments as a Houston police officer and tactical investigator; Chicago police officer, investigator, and Internal Affairs agent exercising investigative authority directly through the Superintendent of Police; U.S. Drug Enforcement Administration task-force agent; and an Illinois State's Attorney detective.
Service Record
- Houston Police DepartmentPolice officer and tactical investigator
- Chicago Police DepartmentPolice officer and investigator
- Chicago Internal AffairsAgent exercising investigative authority directly through the Superintendent of Police
- U.S. Drug Enforcement AdministrationTask-force agent
- Illinois State's AttorneyDetective
Use of force, internal affairs, and gang investigations
Throughout his career, Guillermo developed specialized expertise in some of law enforcement's most demanding investigative areas. He is an experienced authority in police use-of-force investigations, internal affairs investigations, and gang investigations, with a professional background that provides an understanding of these matters from both street-level and organizational perspectives.
His experience across multiple agencies and investigative environments enables him to:
Examine Facts Independently
Drawing on experience across multiple agencies and investigative environments.
Recognize Weaknesses
Identify procedural and operational weaknesses.
Assess Investigative Integrity
Evaluate whether an investigation holds together from start to finish.
Separate Process from Substance
Distinguish between practices that merely satisfy a process and those capable of surviving serious administrative, legal, and public examination.
Investigative judgment and analytical discipline
Supported by graduate-level education in criminal justice and extensive law enforcement training, Guillermo brings The Advisory Bureau's clients a combination of investigative judgment, field experience, and analytical discipline developed over decades of professional practice.
His expertise is particularly suited to agencies seeking independent assessment of sensitive investigations, review of use-of-force and internal affairs matters, improvements to investigative procedures, stronger supervisory practices, and reduction of organizational risk.
Particularly Suited For
- Independent assessment of sensitive investigations
- Review of use-of-force and internal affairs matters
- Improvements to investigative procedures
- Stronger supervisory practices
- Reduction of organizational risk
Education and Training
- Graduate-level education in criminal justice
- Extensive law enforcement training
Through Guillermo's expertise, The Advisory Bureau provides clients with experienced investigative insight when the facts, the process, and the conclusions all have to stand on their own.
Put this experience to work for you.
Tell us what you are facing. You can also reach Guillermo directly at Guillermo@theadvisorybureau.com.