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Daniel Markle

Daniel Markle is the owner of Markle Investigations, Inc, and is Duffy Law’s go-to Criminal, Title IX, and Student Conduct Code Defense Investigator.

With over 35 years of investigative experience, Markle and his team bring a deep knowledge base and skill set to their work ranging from social media and digital forensics to undercover surveillance, to evidence gathering and witness interviewing.

He has conducted thousands of state and federal criminal investigations dealing with, among other charges, sexual assault, weapons and drug trafficking, and white collar fraud. Markle has worked numerous college and university conduct code violation cases including assisting Duffy Law with its representation of complainants, accused and witnesses on sexual misconduct and hazing cases.

Whether in person, or via secure web conferencing for Duffy Law clients based outside of Connecticut, Markle gathers and helps evaluates the strength and credibility of purported evidence, and helps develop strategy and tactics to advance our clients’ cases.

How Can We Help?

How Can We Help?

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  • President/Owner/Investigator, Markle Investigations, Inc, North Haven, CT, 1988 – present
  • Enforcement Agent, Connecticut Department of Revenue Services, Special Investigation Section, Hartford, CT, 1981 – 1986)


  • Licensed Private Detective, CT Department of Emergency Services and Public Protection, Division of State Police
  • Member, Connecticut Association of Licenced Private Investigators
    Connecticut Association of Licenced Private Investigators


  • B.A., Criminal Justice, American University, 1980
  • Connecticut State Police Protective Services Academy, 1981

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