Aaron G. McCollough

Nathaniel Carden is a top attorney recognized by Best Lawyers in the practice area(s) of Litigation and Controversy - Tax. Nathaniel, who practices law in Chicago, Illinois, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Nathaniel is held by other top lawyers in the same geographic and legal practice area.

Adam Damerow is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Adam, 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 Adam is held by other top lawyers in the same geographic and legal practice area.

Kevin L. Kolton is a top attorney recognized by Best Lawyers in the practice area(s) of Construction Law and Litigation - Construction. Kevin L., who practices law in Chicago, Illinois, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kevin L. is held by other top lawyers in the same geographic and legal practice area.

Michael Carrillo advises individuals and businesses on patent, trademark, copyright and trade secret matters, as well as on foreign and domestic patent and trademark protection. Michael navigates clients through and beyond developing, managing and policing small and large IP portfolios, creating practical strategies that leverage his clients’ assets while safeguarding their bottom line. A member of the firm’s Management Committee, Michael is listed among The Best Lawyers in Americ...

Stephanie S. McCann focuses her practice on corporate finance. She represents private equity groups, commercial lending institutions and major public and private companies in connection with the structuring, negotiation and documentation of domestic and international secured and unsecured financing transactions, including senior, mezzanine and subordinated debt transactions, acquisition financings, recapitalizations, loan workouts and restructurings. Stephanie is the chair of the Firm’s...

Brian C. Rupp is a top attorney recognized by Best Lawyers in the practice area(s) of Patent Law. Brian C., who practices law in Chicago, Illinois, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Brian C. is held by other top lawyers in the same geographic and legal practice area.

Mr. Kilyk practices exclusively in the field of intellectual property law, especially patent law. Mr. Kilyk specializes in patent post-grant review proceedings, inter partes reexaminations, interferences, and oppositions, as well as legal opinions, prosecution, and litigation matters, with specific concentration in the areas of biotechnology, chemistry, and pharmaceuticals. Recent technologies with which he has been involved include biosimilars, new chemical compounds, nucleic acid sequences,...

Mark Grossmann is global chair of Katten's Corporate practice. Mark knows how to make deals happen. For more than 20 years, he has guided principals and finance sources alike through critical transactions that have helped them grow, compete and realize value. He is known for a refreshingly direct approach that cuts away extraneous issues and gets to the heart of what the parties need. Mark knows that lawyers are often seen as obstacles who can bury the deal in the legal details. He takes a di...

Maureen O'Brien is a partner in the Chicago office of Kirkland & Ellis LLP. Maureen's practice includes a broad range of employee benefits and executive compensation matters, and she has extensive experience with the M&A aspects of employee benefits and executive compensation, including strategic and private equity transactions. Maureen advises clients on the design and implementation of qualified and nonqualified retirement plans, welfare plans, Section 409A matters and equity and in...

Graham C. Grady is a top attorney recognized by Best Lawyers in the practice area(s) of Government Relations Practice and Land Use and Zoning Law. Graham C., who practices law in Chicago, Illinois, has been recognized since 2009. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Graham C. is held by other top lawyers in the same geographic and legal practice area.