Jay H. Janssen

T. Markus Funk Ph.D. is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar. T. Markus, who practices law in Chicago, Illinois, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which T. Markus is held by other top lawyers in the same geographic and legal practice area.

In each year since 2015, Bryan has been listed in the IAM Patent 1000 – The World’s Leading Patent Professionals for Litigation. He is also recognized in Patent Litigation: Full Coverage in the 2018, 2021 and 2022 editions of The Legal 500 United States. Bryan has litigated and counseled on patent matters for companies of various sizes across a variety of complex industries and technologies including medical devices, optical networking, pharmaceuticals, 3-D technology, material co...

Daniel T. Ryan is a top attorney recognized by Best Lawyers in the practice area(s) of Mass Tort Litigation / Class Actions - Plaintiffs, Personal Injury Litigation - Plaintiffs and Product Liability Litigation - Plaintiffs. Daniel T., who practices law in Chicago, Illinois, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Daniel T. is held by other top lawyers in the same geographic and legal practice area.

Representation and counseling of substantial industrial corporations and private investment funds, primarily in connection with public and private business combinations, dispositions and similar transactions, international business transactions, private equity investments, advanced planning for unsolicited acquisition proposals, public and private securities offerings, disclosure issues and other general corporate and securities matters.

Sandy brings a unique perspective combining his legal and business experience to assist his clients in viewing legal issues outside the box. Sandy’s clients appreciate his practical approach to counseling and structuring transactions and relationships to both prevent and solve problems in a manner that leads them to realize their strategic and operational goals. Sandy’s international background and experience have made him especially valuable to international clients looking to se...

Fran is a compassionate and resourceful attorney whose practice encompasses all areas of complex family law, including divorce, marital dissolutions, child custody, allocation of parental responsibility, maintenance and child support, relocation, and asset identification and division. Fran also has extensive experience with prenuptial and postnuptial agreements. Because Harrison LLP also provides depth in multiple related practice areas, Fran’s clients benefit from sophisticated estate ...

Melissa Caballero Dunn is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law and Family Law Mediation. Melissa Caballero, who practices law in Chicago, Illinois, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Melissa Caballero is held by other top lawyers in the same geographic and legal practice area.

Partner at McDermott Will & Emery -- 1991 - present Co-chairman at McDermott Will & Emery -- 2010-present Previously, head of Trial Department and head of White Collar Criminal Defense Practice Group. Served as an Assistant U.S. Attorney in the Northern District of Illinois from 1986-1991 focusing on the prosecution of white-collar crime.

Nicole Berg is a Partner at Keller Postman LLC. She combines an analytical approach to the practice of law with expertise in legal strategy and briefing critical motions to deliver exceptional advocacy on behalf of plaintiffs. At Keller Postman, Nicole’s practice focuses on product liability matters. She sits on the Law & Briefing Subcommittee in the 3M Combat Arms Earplugs MDL—one of the largest group litigation matters in the United States—and is a member of the Plaint...

Bill is chair of the firm’s Labor & Employment practice group. He is a litigator who manages employment-related disputes before federal and state courts and administrative agencies throughout the country, and he also serves as a strategic partner to companies and executives concerning the broad spectrum of critical business and employment matters that impact their operations. Bill’s litigation practice encompasses the full spectrum of employment matters. He litigates and advis...