Mullen Coughlin, Cybersecurity & Data Privacy

Mullen Coughlin welcomes Dennis N. Lueck, CIPP/US, as a Senior Partner to its Litigation practice. Dennis brings 20 years of trial experience in privacy and security cases. He has regulatory experience with agencies such as the California Department of Consumer Affairs (CA DCA), New York Department of Financial Services (NY DFS), U.S. Securities and Exchange Commission (SEC) and the U.S. Consumer Financial Protection Bureau (CFPB). As part of our litigation practice, Dennis will leverage this extensive experience to represent organizations in a wide variety of third-party privacy- and security-related disputes and regulatory investigations.

“I am thrilled to become part of Mullen Coughlin. It’s a privilege to contribute to the Firm’s focused success with specialized privacy- and security-related defense cases. I look forward to our future together,” said Dennis.

Based and licensed in Colorado, Dennis is also licensed in California and New York, as well as numerous U.S. federal courts nationwide. Dennis received his J.D. magna cum laude from Villanova University Charles Widger School of Lawand a B.S. cum laude in Sociology from the University of Utah. As a member of the International Association of Privacy Professionals (IAPP), he holds a U.S. Certified Information Privacy Professional (CIPP/US).

On behalf of the Litigation practice, Co-Chair Carolyn Purwin Ryan said about Dennis, “We are thrilled to have Dennis join us! His two decades of litigation experience and his enthusiasm will be a tremendous asset to the team.”

“Mullen Coughlin is a leader in the security and privacy litigation space,” said Managing Member Jennifer A. Coughlin. “We’ve been at it a long time throughout the country. Dennis’s exceptional talents and decades of experience will allow us to continue to deliver positive results.”

Mullen Coughlin’s nationwide litigation team possess deep subject-matter knowledge, industry experience and insight in data privacy and security class action litigation. We have successfully managed thousands of litigation and regulatory investigation matters on behalf of organizations of all sizes and across all industry sectors in the United States.

Mullen Coughlin General Counsel & Co-Chair of the Litigation practice, Claudia McCarron, presents at the American Bar Association’s 2025 Class Actions National Institute on October 23 in Dallas, TX.

During the session, “Tie-Down Roping: An MDL Data Breach Class Action,” Claudia and fellow defense and plaintiff attorneys explore the use of Multi-District Litigation (MDL) in data breach class actions – using their experience of leading hundreds of similar cases to successful conclusions. Claudia provides her and Mullen Coughlin’s perspective on the most effective and efficient ways to manage these types of cases – both from a strategic and logistical perspective – via a variety of ways including practical and novel motion practice, discovery and resolution.

The ABA Class Actions National Institute brings together trial attorneys from around the country to discuss tips, techniques and best practices for leading class action trial practices. Learn more and register to attend here.

Mullen Coughlin is proud to be a Silver-level supporter of Zywave’s 2025 Cyber Risk Insights Conference (CRIC) held in New York on October 29. This year, Partner Greg Bautista lends his time and thought leadership to the Conference as an Advisory Board member, assisting in Conference planning including with content selection, agenda development and speaker selection.

In addition, Partner & Co-Chair of the Firm’s Litigation practice, Carolyn Purwin Ryan, presents during the session “The Latest Litigation Landscape.” Carolyn and the panel dive into the new privacy litigation landscape, taking a look at the new sources of cyber lawsuits, actions and claims against service providers and emerging litigation related to wire fraud and similar fraudulent funds transfer incidents.

Learn more about the Conference here.