Basileios "Bill" Katris Partner
  • D 312.606.3221
  • F 312.267.2233
"My 25 year-old business that I built from the ground up was facing company-ending litigation in over 20 states and two continents; Bill was there for me for the long haul and methodically and practically approached this crisis, which eventually saved my company and its 80+ employees. I cannot thank Bill enough for all he did for me." - G.G.

Bill is a leader in HMB’s Technology practice and a partner in the firm’s Litigation Group. He focuses his practice on complex commercial litigation, counseling on data privacy, cyber-security and related intellectual property issues, business divorces and litigation avoidance counseling.

With extensive litigation experience, Bill is a valuable asset in counseling companies and individuals that seek to assess, manage and/or eliminate potential liability risks. He is an accomplished trial attorney who regularly handles highly sensitive “business divorces” and other complicated litigation matters, including matters involving alleged data theft and misappropriation of trade secrets.

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Bill represents clients ranging from small business owners to large publicly traded companies in all aspects of their business, consumer and employee relationships. He has extensive experience in the technology sector, working with internet start-ups, mobile marketing and mid-market technology companies.

With extensive litigation, arbitration and counseling experience involving a wide range of commercial disputes, trust and estate controversies and business torts, Bill represents clients in complex litigation arising from breach of fiduciary duties, data usage, intellectual property disputes, the Telephone Consumer Protection Act (“TCPA”), breach of contract/contract interpretation, product liability, real estate transactions, employment issues, unfair competition, trade secret misappropriation, fraud, corporate mismanagement and business defamation issues.

Creative and Practical Counsel

Clients rely on Bill’s creative, yet practical approach to resolve controversies, leveraging his pre-litigation and trial experience to guide them throughout the entire process.


  • Lead counsel in the representation of a minority shareholder in his dispute with the majority shareholder of an Illinois based multi-million dollar medical product and services operation. A settlement was successfully negotiated for the buy-out of the client’s share of ownership interests and restrictive covenants.
  • Co-lead counsel in the representation of a large insurance services corporation against a former corporate officer and director who went to an industry competitor and improperly took client’s proprietary information and over 30 of its employees with him. A multi-million dollar settlement was achieved in favor of client after a successful motion practice relative to the competitor’s electronic discovery.
  • Lead counsel for a general contractor defending claims against a municipality and a developer for alleged construction defects in a multi-million dollar condominium conversion.


Chicago-Kent College of Law, J.D.

Loyola University Chicago, B.A., cum laude

King’s College of London, Study Abroad



U.S. District Court for the Northern District of Illinois, Trial Bar

U.S. District Court for the Eastern District of Wisconsin

Professional Memberships

American Bar Association, Member

Illinois State Bar Association, Member

ABA Business Law Section Member (Cyberspace Law, International Business & Corporate Counsel Committees)

ABA Science & Technology Law Member (Big Data, Cloud Computing, Data Property Rights & Internet of Things Committees)

ABA Section of Litigation Member (Trial Practice: Email & Social Media, Intellectual Property & Professional Services Liability Committees)


  • Insurance Claims & Related Issues Due to COVID-19 - What Every Business Should KnowMay 12, 2020

    May 12, 2020 As COVID-19 presses state and local governments to continue their shutdown orders, some businesses are incurring extensive expenses and losses. Whether the business is open with limited capacity, allowing employees to work from home, or closed until the orders are lifted,  businesses are asking if and how insurance can provide relief. This article provides information on the…

  • Work From Home Insurance AlertApril 30, 2020

    Many current businesses own cyber insurance policies that actually may not cover incidents or claims that are the result of an employee using his/her own personal device(s) for Work From Home (“WFH”) purposes for their employer. This is an easy mistake for employees as WFH is the current norm. As with all insurance contracts, whether there is coverage or not…

  • Data Scraping Survives! (At Least For Now...) Key Takeaways From 9th Circuit Ruling on the hiQ vs. Linkedin CaseSeptember 20, 2019

    The original case was brought in California federal district court in 2017 by a company (hiQ) trying to protect its business of using publicly posted user data on LinkedIn. The California federal district court awarded a temporary restraining order against LinkedIn. This order allowed hiQ to keep scraping data off of LinkedIn’s platform on employees in connection with one of…

  • As Reports of Hacking and Wire Fraud/BEC Scams Increase, Here's What You Can Do to PrepareJune 12, 2019

    Business Email Compromise ("BEC") is a scam perpetrated by cyber criminals to attack businesses that first began to be tracked and reported by the FBI in 2013. BEC typically consists of phony or phishing emails that appear to originate from a company executive or member of a company's accounting or finance department containing fraudulent payment instructions with the objective to…



  • The BEC/FBI Tech Hacking Advisory - Doing Business with Foreign Suppliers/BusinessesOctober 29, 2015

    It was not so long ago that in the cyberspace realm businesses only needed to worry about having a good firewall and spam filter to prevent fraud. Now, as technology has advanced so have the fraudsters and the government is warning businesses, especially those conducting business with foreign suppliers and/or businesses, of a new and escalating scam called the Business Email Compromise, the BEC.

  • New Illinois Statute Creates Presumption of Invalidity as to Transfers to Caregivers Over $20,000October 11, 2015

    A new section in the Illinois Probate Act, 755 ILCS 5/4-a, et seq., titled "Presumptively Void Transfers," which took effect January 1, 2015, creates a rebuttable presumption that a document that transfers assets upon a person's death, referred to as a "transfer instrument," that transfers $20,000 or more to a caregiver is invalid. The intent of the new law is…

  • Chicago-Kent College of Law, J.D.
  • Loyola University Chicago, B.A., cum laude
  • King’s College of London, Study Abroad
  • Illinois
  • U.S. District Court for the Northern District of Illinois, Trial Bar
  • U.S. District Court for the Eastern District of Wisconsin
500 West Madison Suite 3700
Chicago IL 60661

Phone: 312-606-3200 Fax: 312-606-3232
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