Mr. Koski is a leading lawyer with a concentration in the representation of law firms, professional service firms, business organizations, and individual lawyers on governance, structure, disputes, investigations, legal ethics and professional responsibility, risk management and compliance, and related matters.
Across his career, Mr. Koski has advised professional service businesses – including law firms, accounting firms, and investment advisories – in their domestic and international operations. He also has advised corporate clients and other entities on legal, ethical, and regulatory issues impacting their business and law department operations in US and abroad.
Before joining Miller Shakman, Mr. Koski spent two decades as inside counsel for the world’s largest global law firm. During his tenure first as US General Counsel and then as Global Chief Legal Officer, he was responsible for meeting the legal needs of a firm that grew to 13,000+ lawyers and business professionals, generating multibillion-dollar annual revenues, across 160+ locations in 80+ countries. He chaired the Global Risk Management Committee, and served on the Global Management Committee.
Since 2019, Mr. Koski has been a Lecturer in Law at the University of Chicago School of Law, where he teaches Professional Responsibility in Representing Business Organizations. Prior to his affiliation with the University of Chicago, he also taught as a guest lecturer at Northwestern Pritzker School of Law and other Chicago area law schools.
Mr. Koski is the founder and for more than a decade has Chaired the Chicago General Counsel Forum, a roundtable for law firm general counsel and ethics lawyers at international and domestic law firms.
He is a member of the Association of Professional Responsibility Lawyers, the American Bar Association’s Center for Professional Responsibility, the Collaborative Association of Professional Responsibility Instructors in Illinois (CAPRII), and other peer groups of law firm general counsel and ethics lawyers. He has conducted more than 100 accredited lectures, seminars, and other presentations and writes frequently on legal ethics, risk management, and related topics.
Mr. Koski is a Board Member of Lawyers Defending American Democracy and is active in the intersection of legal ethics and democratic principles.
Education
J.D., University of Miami, 1992
Order of the Coif
University of Miami Law Review, Senior Articles Editor
B.A., Vanderbilt University, 1989
Political Science and Psychology
Experience
Senior Counsel with this firm since 2026
University of Chicago School of Law (2019-Present)
Lecturer in Law
Professional Responsibility in Representing Business Organizations
Dentons Group (a Swiss Verein)
Global Chief Legal Officer Emeritus (2025-2026)
Global Chief Legal Officer (2014-2025)
Chair, Global Risk Management Committee (2014-2025)
Sonnenschein Nath & Rosenthal / SNR Denton US LLP / Dentons US LLP
Partner and General Counsel (2005-2010)
Partner and Deputy General Counsel (2000-2005)
Associate, Litigation Practice (1993-2000)
American Bar Association, Chicago Illinois (1992)
Judicial Administration Division
Lawyer's Conference Task Force on the Reduction of Litigation Costs and Delay Research Consultant
Bar Admissions
Florida
Illinois
United States Supreme Court (resigned)
US Court of Appeals for the Second Circuit
US Court of Appeals for the Third Circuit
US Court of Appeals for the Sixth Circuit
US Court of Appeals for the Seventh Circuit
US Court of Appeals for theEleventh Circuit
US District Court for the Eastern District of Michigan
US District Court for the Eastern District of Wisconsin
US District Court for the Northern District of Illinois
Memberships & Recognitions
American Bar Association, Member
American Bar Association’s Center for Professional Responsibility, Member
American Bar Foundation, Life Fellow
Association of Professional Responsibility Lawyers, Member
Chicago General Counsel Forum, Founder and Chair
Chicago Inn of Court, Former Member
Collaborative Association of Professional Responsibility Instructors in Illinois, Charter Member
Crain’s Chicago Business, Former “Notable Gen X Leaders in Law”
Lawyers Defending American Democracy, Board Member
University of Chicago School of Law, Lecturer in Law
Youth & Opportunity United, Former Board President and Board Member
Selected Publications
“Is the Attorney General Ethical? The Florida Bar Doesn’t Want to Inquire,” ETHOS: The Newsletter of CAPRII (Fall 2025)
“Trump Era Lawyer Ethics,” ETHOS: The Newsletter of CAPRII (Fall 2024)
Co-Author, “Beyond Tokenism: Pursuing Policy-Driven DEI Every Day of the Year,” IFLR, March 2023
“Counsel To Counsel: 5 Challenges For A Law Firm GC,” Law 360, 2017
“Attorney Client Engagement Agreements: The War of the Forms,” PLI Ethics Programs: Chicago 2016, Practising Law Institute, 2016
“Privileges and Waiver,” PLI Ethics Programs: Chicago 2014, Practising Law Institute, 2014
“Ethics Fundamentals for Inside Counsel,” PLI Ethics Programs: Chicago 2013, Practising Law Institute, 2013
“Ethical Considerations When Dealing With Complex Compliance Issues,” ABA Section of Litigation Food & Supplements Second Annual Workshop, June 12, 2012
Co-author, “Hot Topics in Mergers and Acquisitions 2012,” Practising Law Institute, 2012
Co-author, “Illinois MCLE Marathon 2012,” Practising Law Institute, 2012
“Spoiler Alert: 50 Years of Movie-Lawyer Ethics,” Pennsylvania Bar Institute’s 17th Annual Health Law Institute, March 15 – 16, 2011
Co-author, “The Lawyer's Role in Advising Franchisors: When Is Too Much Too Much?,” International Franchise Association's 42nd Annual Legal Symposium, May 17 – 19,2009
Co-author, “Turning Defiant Franchisees Into Compliant Franchisees,” International Franchise Association's 40th Annual Legal Symposium, May 6 – 8, 2007
Co-author, “Waive Farewell to Uncertainty: EchoStar Clarifies Scope of Waiver in Advice-of-Counsel Defense,” The Computer and Internet Lawyer, Vol. 23, No 9, September 2006
“Doing Business in the United States: Illinois,” PLC Cross-border Doing Business in... Handbook, 11th Edition, Practical Law Company, 2006
Contributing author, “Making Partner: A Guide for Law Firm Associates,” American Bar Association, 3rd Edition, 2006
