G. Hans Rentrop

Mark Cantor specializes in trademark litigation and has tried various cases involving patents, trademarks, trade secrets, and copyrights. Mark is one of the founders of the firm and has been with the firm as a Shareholder since 1983. He has over 35 years of IP litigation experience. He has extensive experience in dealing with complex litigation matters in all technology areas and has tried cases relating to patents, trademarks, trade secrets and copyrights in state and federal courts and admi...

David A. Kotzian is the managing member of David A. Kotzian, PLLC in Farmington Hills, Michigan. For the past 24 years, his practice has been concentrated in employment rights litigation, counseling, arbitration and mediation. Mr. Kotzian is a 1984 graduate of the University of Michigan Law School, and also earned his Ph.D. in Labor Economics from the University of Michigan. He is the Past Chair of the Oakland County Employment Law Committee, and a past Council Member of the State Bar of Mich...

Mr. Walters concentrates his practice in employee benefits, corporate law and estate planning. He has more than 25 years of experience counseling employers on all aspects of employee benefit plan formation, administration, and taxation. He also helps business clients form and develop their enterprises, including securing financing of assets and real estate. Mr. Walters frequently assists health care professionals with general corporate and employment matters with particular emphasis on retire...

Jennifer Hetu’s practice focuses on trademark law and brand protection. She advises businesses of all sizes on a wide range of trademark matters in the U.S. and international markets, collaborates with foreign law firms on worldwide trademark protection, and provides counseling regarding U.S. use and registration. She also counsels businesses in the rapidly growing cannabis industry on how to navigate trademark protection strategies in the current landscape. She is a former trademark at...

Joan C. Skrzyniarz is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Joan C., who practices law in Troy, Michigan, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joan C. is held by other top lawyers in the same geographic and legal practice area.

Ziyad I. Hermiz is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Trade Secrets Law. Ziyad I., who practices law in Birmingham, Michigan, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ziyad I. is held by other top lawyers in the same geographic and legal practice area.

John LeRoy is a highly skilled litigation professional. He uses his electrical and mechanical engineering background, and two decades of intellectual property litigation experience, to represent his clients in high-tech legal disputes and complex licensing negotiations. John’s practice focuses on patent, trade secret and copyright litigation involving software, electronics, and mechanical systems. With over 20 years of experience, a Master’s degree in electrical engineering, and a...

Mahesh K. Nayak concentrates his practice in litigation and business law. He regularly engages in international and cross-border matters. Prior to joining private practice in 1999, Mahesh served both as Assistant Attorney General with the Michigan Attorney General's Office and as a criminal prosecutor with the Wayne County Prosecutor's Office in Detroit, Michigan. Mahesh had the advantage of trying many cases at a young age. Corporate Counsel Mahesh serves as a trusted advisor to business own...

Christopher Smith is a distinguished intellectual property attorney specializing in patent litigation, IP counseling, licensing, and patent and trademark prosecution, with extensive experience representing Fortune 500 companies and startups across diverse industries. Christopher Smith is a highly regarded intellectual property attorney, recognized for his work in IP litigation, especially in patent litigation. His practice encompasses patent and trademark prosecution and the preparation of co...

David Marsh, a shareholder with the firm, has extensive experience in commercial and residential real estate transactions and environmental law matters. He has counseled purchasers and sellers of commercial and residential real estate with respect to drafting and negotiating purchase agreements, leases and closing documents; obtaining title insurance coverage; conducting necessary due diligence (including inspections and environmental surveys); and arranging for and negotiating financing. Mr....