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Thomas E. Fischer

City of Milwaukee Police Department, Detective (retired)

Thomas E. Fischer is a career detective whose experience includes 30+ years with the Milwaukee Police Department. Extensive professional field experience and expertise includes white collar crime, homicide, and armed robbery investigations. Managerial and administrative proficiencies include labor contract negotiation with the City of Milwaukee and past vice president and chief lobbyist for the Milwaukee Police Association at the City and State levels. Mr. Fischer opened his professional investigative firm in 2010. One of the more unique cases he worked on was published in PI Magazine (November/December 2018 issue, article entitled "Should You Believe Your Client").

2021: Qualified as an expert investigator in a divorce case, John Puchner v. Marya Puchner, Waukesha County Case. No. 2019FA000089.

2020: Nationally accredited as a Certified Legal Defense Investigator through the Criminal Defense Investigation Training Council. Certification is based on passing the Component Method of Criminal Investigation and Case Management program, proof of successfully investigating at least 25 criminal defense assignments, recommendations from defense council, at least two years experience working as a criminal defense investigator, and successfully passing a written exam.
Qualified as an expert in police procedure, techniques, and investigations in State of Wisconsin v. Ross Bolingbroke, Milwaukee County Case No. 17CT1331.

2017: Nationally accredited as a Certified Legal Investigator through the National Association of Legal Investigators (NALI). Certification is based on investigative experience, written and oral examination, an ethics interview, and published work. Currently, this title is held by less than 75 Investigators worldwide.
2016: Qualified as an expert in police procedure, techniques, and investigations in State of Wisconsin v. Robert Smith, Jefferson County Case No. 14CF000310.
2006-2010: Vice President of the Milwaukee Police Association/Chief Lobbyist/Board of Directors City of Milwaukee Pension System
1998-2006: Detective, Robbery, White Collar Crime, and Homicide Units
1991-1998: Detective/Police Officer, Robbery Task Force
1982-1991: Police Officer, Districts 4 and 7 (Milwaukee, WI)

2018: Wisconsin State Public Defender's Office (SPD), Defending Drug Overdose Homicides Cases (8 hour course). Ongoing SPD training on a variety of topics. 
2017 - present: National Association of Legal Investigators (NALI) training conference.

2016: Wisconsin State Public Defender's Office, Working as a Team to Investigative Cases:  An Institute For Attorneys and Investigators (one week course)
2011 - present: Professional Association of Wisconsin Licensed Investigators (PAWLI) annual training conferences
2007: Harvard Law School, Cambridge, MA, Police Union Leadership   
2006: AELE Law Enforcement Legal Center, Las Vegas, NV, Employment and Labor Law Course

2006: International Union of Police Association, Sarasota, FL, Pension Benefits

1979 - 1983: Milwaukee Area Technical College, Milwaukee, WI, Police Science

  • Homicide Unit: Extensive training in homicide, suicide, and suspicious deaths in the City of Milwaukee. Supported the investigation of police officer critical incidents i.e. shootings and in-custody deaths.
  • White Collar Crime Unit: Provided extensive communication and interaction with major financial institutions, various outside local and federal jurisdictions, and a variety of citizens both within and outside the City of Milwaukee.
  • Managed numerous investigations including forgery, issue of worthless checks, identity theft, theft by fraud, employee theft, embezzlement, computer crimes, and financial transaction card crimes.
  • Developed and implemented rules, regulations, and standard operating procedures for the White Collar Crime Unit.
  • Media spokesperson for the White Collar Crimes Unit which included providing several identity theft and forgery seminars and speeches to various civic groups, law enforcement agencies, and the print and television media.
  • Responsible for conducting white collar crime training to all members of the Milwaukee Police Department including in-service and new detective training. Led relationship management at financial institutions including customer accounting.
  • Responsible for identity theft and forgery search warrants while assisting other officers and detectives in obtaining subpoenas, court orders, and preparing white collar crime investigations for prosecution.
  • Armed Robbery Unit: Investigation of bank robberies, business robberies, and street robberies throughout the City of Milwaukee.
  • Investigation of residential and business burglaries throughout the City of Milwaukee.
  • Planned, organized, and managed robbery stakeouts for financial institutions and businesses throughout the City of Milwaukee.
  • Assisted the District Attorney’s Office in the prosecution of homicide, robbery, burglary, and numerous other felony/misdemeanor cases.
  • Recipient of 51 meritorious arrests.
  • Four commendations from the City of Milwaukee Police Department.
  • Two commendations from the FBI.

Octavio "Otto" Delgado

City of Milwaukee Police Department, Detective (retired)

1986-2014 Milwaukee Police Department

  • Detective having experience in criminal, misdemeanor, civil, gang, narcotics, and fraud investigations
  • Handled numerous investigations regarding drug cases. Extensive experience in undercover assignment, conducting surveillance along with other Milwaukee PD personnel as well as other agencies (Federal and State
  • Extensive experience in interrogations/interviews of witnesses and suspects
  • Experience in obtaining search warrants on felony investigations
  • Experience in State/Federal drug investigations in Wisconsin and throughout the United States that included transportation by use of trains, autos, and the U.S. postal service
  • Certified on the use and training of drug detection dogs
  • Extensive experience testifying in Municipal and Circuit courts, as well as in civil proceedings and depositions
  • Provided training to law enforcement personnel in narcotics investigations

Professional Accolades

  • Awarded the Milwaukee Police Department's Captain Award
  • Numerous Chief of Police commendations for investigation beyond the call of duty
  • Numerous citizen commendations

2002 - 2007: Licensed Realtor, which consisted of inspecting buildings for code violations and writing legal contracts
Worked for a private company that conducted criminal investigations for the States of Wisconsin, Illinois, and Texas

Christopher Ederesinghe

City of Milwaukee Police Department, Detective (retired)

1992-2019, Milwaukee Police Department

  • Retired Detective having experience in criminal, felony, misdemeanor, and civil investigations.
  • Twenty seven years of knowledge related to criminal behavior with an emphasis on organized criminal drug trafficking organizations and interdiction investigations.
  • Extensive knowledge as a canine handler and investigator in cases related to narcotics manufacturing and distribution.
  • Experienced in pharmaceutical and prescription crimes including those related to medical professionals and business corruption cases.
  • Experienced in prostitution/human trafficking, robbery, homicide, and property crime investigations.
  • Extensive knowledge in leadership of undercover operations and surveillance, conducting surveillance and investigations along with other Milwaukee PD personnel as well as federal and state investigators.
  • Experienced in interviewing and witness statement collection.
  • Conversant in Spanish.
  • Experienced in suicide and overdose cases.
  • Experienced in obtaining search warrants on felony investigations.
  • Deemed qualified in Wisconsin state court as an expert witness for narcotics and weapons related investigations.
  • Experienced Task Force officer for U.S. Postal Inspector Service, FBI, DEA, and DOJ.
  • Experience conducting investigations with the Wisconsin Pharmaceutical Board and Department of Wisconsin Consumer Protection.
  • Experienced in training and public instruction to Wisconsin prosecutors, healthcare professionals, and law enforcement related to interdiction, illegal drug manufacturing, and confidential informant training.
  • Extensive experience testifying in Municipal, Circuit, and Federal courts, as well as civil proceedings and depositions.
  • Provided narcotics/pharmaceutical and confidential informant training to law enforcement recruits and personnel at the Milwaukee Police Department’s Regional Training Center.
  • Experienced in commercial pharmacy operations and environmental health and safety compliance.
  • Experienced in DEA audit and EPA compliance standards related to controlled pharmaceutical inventory and commercial chemical waste.
  • Experienced in commercial surveillance equipment intrusion alarm and access control networks.
  • Experienced in writing standard operating procedures related to an emergency/active shooter guidance for a national corporation.
  • Experienced in assessing commercial threat risks (shrink, catastrophic, and criminal) and security needs nationally for commercial pharmaceutical acquisitions and improving those of existing operating locations.

Professional Accolades

  • Awarded the Milwaukee Police Department's Captain Award
  • Numerous Chief of Police commendations for investigation beyond the call of duty (on and off duty)
  • Hometown Hero (K-9 Dan), local and national service award, Modern Woodman 2019
  • Numerous citizen commendations
  • Toxicology forensic death investigation
  • Evidence collection
  • National Certification experience in the use and training of narcotics canines
  • Advanced knowledge in the training and use of explosives detection, apprehension/police patrol canines.

Angela "Angie" Gasior

City of Greenfield Police Department, Police Officer (retired)

1990-2010, Greenfield Police Department

  • Forensic interviews including the step-wise method for children
  • Field Training Officer
  • Drug Abuse Resistance Education (DARE) teacher
  • SWAT team hostage negotiator
  • School Resource Officer (Greenfield Middle School)
  • School Liaison Officer (Whitnall Middle and High Schools)
  • Property and Evidence Officer
  • Dispatcher

After retiring from the Greenfield PD, I found my new calling as a licensed private investigator in North Carolina primarily focusing on criminal defense cases to include rapes, murders, and serious felonies. I also worked on misdemeanors, civil cases, private hire, domestic, and capital murder cases (2017-2020)

Kara Kathrein

City of Milwaukee Police Department, Identification Supervisor (retired)

Kara has 18 years of law enforcement experience with the Milwaukee Police Department. During her tenure, Kara held several ranks including Police Officer, Identification Technician, Detective, Latent Print Examiner, and Identification Supervisor.

Milwaukee Police Department    October 1991 – August 2009

Identification Supervisor – Responsible for all functions of the Identification Division including:

  • Direct responsibility and supervision of Identification Technicians and Latent Print Examiners.
  • Crime scene investigations, collection and storage of evidence.
  • Conducted internal investigations.
  • Responsible for training of Latent Print Examiners.
  • Developed and implemented the Latent Print Examiner’s training program.
  • Revised the Identification Division’s Standard Operation Procedures.

Latent Print Examiner

  • Analyzed and compared latent fingerprint lifts.
  • Searched latent fingerprints through various AFIS computer systems.
  • Effected latent fingerprint identifications through comparisons.
  • Documented findings of examinations and testified to same.

Identification Technician

  • Photographed crime scenes.
  • Processed crime scenes for latent fingerprints.
  • Collected physical evidence from scenes.

Detective – Violent Crimes Unit

  • Investigated criminal offenses.
  • Interviewed victims and witnesses.
  • Interrogated suspects.
  • Crime scene investigation.

Police Officer – Sexual Assault Unit, Sensitive Crimes Division

  • Interviewed sexual assault victims.
  • Crime scene investigation.
  • Collected physical evidence from scenes.
  • Presented cases to the District Attorney’s Office for review/charging.


Bachelor of Science Degree, Criminal Justice

Carroll University – Waukesha, WI

Associates Degree, Police Science

Milwaukee Area Technical College – Milwaukee, WI

The Professional Forensic Science Program – Diploma

Ashworth Career School – Atlanta, Georgia

Randolph Olson

City of Milwaukee Police Department, Police Lieutenant (retired)

Olson has 36 years of experience in the law enforcement field, with 30 spent serving on the Milwaukee Police Department (1981-2011).  During his career at Milwaukee PD, Olson worked uniform and plainclothes as a police officer for 11 years in some of the busier areas of Milwaukee while routinely responding to everything from felonies to misdemeanors.

Following promotion to detective, Olson earned assignment to the Homicide Unit where he worked for 15 years investigating a multitude of high-profile cases. He maintained his reputation for hard work, thorough scene and interview investigation, keen interrogation skills, reliable courtroom testimony, and clearance of cases through teamwork.

As a lieutenant, Olson supervised the late shift Homicide Unit for two years before moving to the Organized Crime Unit, and ultimately a federal drug task force where he supervised a covert surveillance unit.

During his tenure with MPD, he was the recipient of several awards for bravery and meritorious service for action taken, investigations, and arrests.   Past training has included numerous federal, state, and privately-sponsored sessions in the following areas: profiling, cold case and DNA investigation, death investigation, interrogation techniques, crime scene processing, officer related events, surveillance, and weapons training.

In 2011, Olson added to his previous experience and training in surveillance and counter surveillance by completing a course in covert surveillance offered through Trojan Securities International (www.trojansecurities.com).

We are listed among the 'Top 10 Private Investigators' on Expertise.com.