Mission Advisory Group provides an array of legal, investigative, and protective services for businesses and individuals alike throughout New England.

Why Use Mission Advisory Group

Mission Advisory Group combines the expertise and resources of skilled private investigators with the legal acuity of experienced investigative attorneys to offer a complete approach to fact-finding, evidence gathering, legal analysis, and risk mitigation.

We offer comprehensive practical and legal solutions, whether you are seeking strategic advice to proactively avoid potential problems, unexpectedly facing a crisis, or simply need information to make fully-informed personal, legal, or financial decisions.

Legal, investigative and protective services, Massachusetts

Our Services


Legal Services, Protective and Investigative Service, Mass.

Legal Services

  • Conducting Internal Investigations

  • Conducting Independent Investigations

  • Criminal and Civil Litigation Strategy

  • Criminal Defense

  • Liaise with Government Agencies and Law Enforcement on behalf of Clients

  • Representation of Businesses/Individuals under Government Investigation

  • Risk Assessment and Mitigation

Investigative Services

  • Asset/Property Searches

  • Background Checks

  • Cold Case Review

  • Criminal and Civil Litigation Support

  • Data Analysis

  • Death Investigations

  • Digital Forensic Analysis

  • Missing Persons

  • Polygraph Examinations

  • Surveillance

  • Tracking Device Detection and Counter-Surveillance Measures

  • Witness Interviews

Protective Services

  • Executive Protection

  • Physical Security Site Analysis

  • Cyber Security Threat Management

About Us


Gretchen Lundgren, Attorney, Litigator, Massachusetts

Gretchen Lundgren, Founder/CEO

Gretchen Lundgren is a highly skilled litigator and investigative attorney with over 25 years of experience.  With a background in both civil and criminal law, she understands the importance of identifying and investigating threats to clients’ operational safety and integrity, providing sound legal analysis, and developing effective strategies to mitigate risk. 

  • After graduating from Boston College Law School, Gretchen started her legal career at Choate, Hall & Stewart, where she represented corporate clients in high-stakes civil litigation matters.  She counseled clients regarding a variety of legal issues involving minority shareholder disputes, reinsurance claims, breaches of contract, and wrongful termination.  In addition, she conducted workplace investigations to address allegations of harassment and discrimination, prepared fact and expert witnesses for depositions and trials, and litigated contract and employment matters.

    Gretchen’s interest in public service led her to become an Assistant District Attorney with the Suffolk County District Attorney’s Office for nearly 10 years.  As an Assistant District Attorney, Gretchen responded to crime scenes with local law enforcement officials, advised detectives on preparing search warrants, interviewed witnesses, and conducted grand jury investigations.  As part of her investigations into various crimes, she collaborated with detectives and crime scene investigators to evaluate the results of ballistic testing, tool mark analysis, latent print comparisons, trace evidence analysis, DNA testing, and electronic evidence from mobile phones, computers, and social media sites.  She appeared before juries on a wide variety of felony trials but spent the majority of her career indicting and trying violent crimes and homicides involving intricate fact patterns and complex legal and evidentiary issues.  While with the District Attorney’s Office, Gretchen was selected to serve as a Special Assistant U.S. Attorney. As a SAUSA she worked on joint investigations with federal and local law enforcement agencies to indict and prosecute firearms and narcotics cases. During her time with the Suffolk County District Attorney’s Office Gretchen was presented with the Ralph C. Martin II Award for Outstanding Superior Court Prosecutor.

    Gretchen thereafter joined the U.S. Securities and Exchange Commission to investigate securities fraud and other financial crimes.  At the SEC Gretchen investigated and litigated actions involving crypto-currency Ponzi schemes, insider trading, the sale of unregistered securities, fraudulent representations to investors, misappropriation of client funds by financial advisers, and accounting fraud.  She frequently worked in parallel with the Federal Bureau of Investigation and the U.S. Attorney’s Office when defendants’ conduct violated both civil and criminal laws.    

Stephen C. McManus, Lead Private Investigator

Stephen C. McManus is a retired Boston Police Detective with over 36 years of law enforcement experience.  Stephen received his Bachelor’s Degree in Criminal Justice from Curry College, and a Master’s Degree from Western New England College.  He received numerous awards and commendations for bravery and excellence during his tenure as a law enforcement officer.

  • After graduating from the Boston Police Academy in 1986, Stephen patrolled the neighborhoods of Dorchester and South Boston, responding to 911 calls for health and safety emergencies.

    In 1987, Stephen was assigned to several teams within the elite Special Operations Unit, where he worked for eight years. On the Dive Team, Stephen performed underwater search and rescue operations and the recovery of weapons and other evidentiary items. On the Entry and Apprehension Team, he participated in securing barricaded suspects, the release of hostages, and apprehending armed and violent felons. In addition, Stephen was a member of the motorcycle unit and performed escorts for dignitaries visiting Boston, including world leaders, U.S. presidents, government officials and high-profile individuals.

    Stephen was assigned to the Drug Control Unit in 1995 and served there in several capacities for over 23 years. Initially, Stephen was assigned to various Boston neighborhoods including South Boston, Dorchester, the South End, and Roxbury to investigate the possession, trafficking, and manufacturing of illegal narcotics. This involved street level surveillance, the use of confidential informants, and executing search warrants. In 2008, Stephen was selected to become a Federal Task Force Officer with the FBI. Stephen and his squad focused on the disruption of criminal activity by targeting violent gangs, drug trafficking organizations, and other criminal enterprises in Boston and throughout New England. These long-term, large-scale investigations involved partnerships with state and federal law enforcement agencies and resulted in removing significant numbers of dangerous offenders from the community.

Our Investigators

Mission Advisory Group's licensed private investigators have a broad array of skills to meet your needs. 

  • Our investigators, from local, state and federal law enforcement agencies, have decades of experience in:

    Accounting Fraud

    Crime Scene and Forensic Evidence Analysis

    Cyber Crimes and Online Exploitation

    Death Investigations

    Dignitary Protection and Mobile Operations

    Financial Crimes

    Firearms and Narcotics Trafficking

    Fugitive Apprehension

    Insurance Fraud

    Internal Investigations

    Interview and Interrogation Techniques

    Locating Missing Persons 

    Polygraph Examinations

    Sexual Assault Investigations

    Workplace Harassment

    Discrimination Investigations

Contact Us


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