Our Attorneys

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Diederich Law Firm

Donald Mallo, of counsel

Donald Mallo, of counsel
Employment Law

Donald graduated from Queens College with a degree in History and Political Science. Subsequently, he attended the Maurice A. Deane School of Law at Hofstra University and graduated with his law degree in 1974. Donald has over four decades of experience, with much of that time spent serving as General Counsel and Chief Human Resources Executive for Fortune 500 companies in the food, service, PEO, and manufacturing sectors.​

Donald is passionate about using all he learned in the corporate sector to expertly defend individuals against major companies. Don is an experienced mediator and labor negotiator, having negotiated hundreds of national and international labor agreements.

Vanesa Castellino, of counsel

Vanessa Castellino, of counsel
Employment Law

Vanessa graduated from Fordham University with a degree in History and Political Science. Subsequently, she attended Brooklyn Law School and graduated with her law degree in 2012. Vanessa has held various Extern and Fellow positions across New York City and State, including stints with The Solicitor’s Office at the US Department of Labor, the NYPD Legal Bureau, and the Equal Employment Opportunity Commission’s Hearings Department. Vanessa is a methodical researcher and writer, and has represented clients before the New York Supreme Court.

Vanessa has an expert understanding of Human Rights Law, Civil Procedure, and Employment Discrimination Law. Furthermore, she is licensed to practice in New Jersey in addition to New York.

Joseph Canepa, of counsel

Joseph Canepa, of counsel
Employment & Immigration Law

Joe graduated from Cathedral College of Immaculate Conception with a Philosophy degree. Then, he attended Georgetown for his Masters Degree and received his law degree from Brooklyn Law School in 1987. Joe works out of New York City, and he has spent over 30 years building a comprehensive general practice handling real estate, bankruptcy, matrimonial, trademark, and immigration law. Joe is licensed to practice across New York State. He is also admitted to the United States District Court Eastern District and Southern District of New York, as well as a member of the United States Supreme Court Bar.

Joe is bilingual and skilled in negotiation, legal writing, trials, domain registration, branding and mergers & acquisitions.

Michael Wolf, JD

Michael Wolf, of counsel

Mike Wolf graduated from the University at Buffalo with a degree in English, followed by the University’s School of Law in Spring of 2023. In law school, Mike focused on criminal and family law, joining the Criminal Justice Advocacy Clinic and staying on post-graduation as a research fellow. Mike is located in Western New York.

Mike carries over a decade of experience in business systems and information technology into his practice of law, where such experience is useful for gathering and analyzing evidence. He is a skilled researcher, legal writer, and negotiator. Mike Wolf is admitted to practice law in the state of New York, where he focuses on employment matters and civil rights cases.

Affiliate Firms

Berzer & Wolf Attorneys at Law

Berzer & Wolf Attorneys at Law
Western New York

Berzer & Wolf is a full-service, family-run law firm based in Williamsville, NY. The firm has over 40 years of accumulated experience practicing across New York State.

Paul Wolf, Esq.

Paul Wolf, Es
Diederich Affiliate

Paul Wolf graduated from Buffalo State in 1986 and received his law degree from Suny at Buffalo in 1991. Paul has legal expertise in various areas including criminal cases, estates and wills, business law, worker’s compensation, and personal injury. You can view Paul’s profile and client testimonials on AVVO.

Cheryl Berzer, Esq

Cheryl Berzer, Esq
Diederich Affiliate

Cheryl Berzer graduated from the State University of New York at Buffalo in 1995 and received her law degree from University of Buffalo in 1998. is an experienced full-service attorney with a particular interest in matrimonial and family law. You can view Cheryl’s profile and client testimonials on AVVO.

Diederich Employment Law Firm

Our Credentials

Bar Admissions:
New York State Bar Association
Massachusetts State Bar Association
American Bar Association
United States Supreme Court Bar Association
United States Second Circuit
Federal District Court

Professional Associations and Memberships:
National Employment Lawyers Association (NELA)
New York State Bar Association
Rockland County Bar Association
Orange County Bar Association

The Glory of a Good Lawyer
Is to Win a Bad Trial.


Firm Victory 01.

Client Testimonial

Thank you to Diederich Law for successfully guiding me through my legal process. I appreciate your legal advice and expertise. May this practice have continued success!

-Daphne, September 2023

Firm Victory 02.

Successful Federal Court Cases

Diederich Law has successfully tried several federal court civil rights cases to verdict. This includes a pregnancy discrimination trial, Blake v. Nyack ($190,000 verdict and reinstatement of employment), and a civil rights case (Anderson v. Osborne), resulting in a $650,000 jury verdict for the end client.

Firm Victory 03.

Precedent-Setting Results

Diederich Law recently settled a high-profile, precedent-setting civil rights case against a municipality, the Town of Chester, for $3.75 million dollars (Sherman v Town of Chester, 752 F3d 554 (2d Cir 2014).