Former chair of Riker Danzig's Environmental group, Dennis J. Krumholz launched the practice shortly after joining the firm in 1981. In the years since, he has been instrumental in building what has become one of New Jersey's leading environmental law practices.

Dennis has been included on the “Best Lawyers” list for Environmental Law by Best Lawyers in America®, a peer review of U.S. lawyers, since 1993. In 2014 and 2012, he was named the Environmental "Lawyer of the Year" for the Newark region by Best Lawyers®, an honor given annually to a single attorney in a particular practice area in each region. Since 2005, he has been ranked in the first tier of New Jersey's environmental lawyers by Chambers USA: America's Leading Lawyers for Business Client's Guide which recognizes him as “one of the preeminent members of the New Jersey Bar” and notes that he "induces nothing but high praise from a striking assortment of market sources." He is described by clients as “an excellent environmental attorney who gives fantastic guidance on regulatory matters,” and “a very strong lawyer who is very cerebral in his approach.” Chambers has called him “exceedingly bright” and “a very knowledgeable lawyer who is at the top of his game.” He is noted as a "founding father" of New Jersey Environmental Law with "terrific business and legal judgment" and "one of the most well-rounded environmental attorneys in New Jersey," quoting sources who say he is a “formidable adversary,” and "he does everything, and handles all of it equally well." The Guide also praises him for being a "first-chair litigator of the highest caliber, and a dean of the Environmental bar," "assuaging the nerves of clients across both litigious and noncontentious issues." 

In 2021, Dennis was honored by NJBIZ with an Icon Award.  The Icon Awards are presented to New Jersey business leaders over the age of 60 for their contributions, success and leadership over their careers. Dennis was also named in Who's Who Legal: USA for Environmental Law, compiled by Law Business Research Limited. Thomson Reuters has included him on New Jersey's "Super Lawyers" list for environmental litigation since 2005 and on Super Lawyers' New Jersey "Top 100" list in 2007, and again in 2009 - 2011.  Dennis is a fellow of the American College of Environmental Lawyers.    See Awards and Honors Methodology

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Environmental law at Riker involves three areas of practice - litigation, transactions and regulatory compliance - and Dennis is adept at serving clients in all three. "I enjoy trying cases and arguing appeals, as well as drafting and negotiating complex transactional documents and counseling clients on difficult regulatory issues," he says.

Dennis was an adjunct professor at Seton Hall Law School. He is a prolific author and a frequent speaker on environmental law topics, demonstrating his technical acumen for this complex work. "Writing forces you to develop a deeper understanding of specific issues from a broader, jurisprudential perspective," he says. 

Dennis began his career in environmental law as a deputy attorney general for the State of New Jersey in the areas of environmental protection and community affairs.

Dennis' quarter-century career has earned him a strong reputation in environmental law. He places a premium on client service, continuing to be personally attentive to each of his clients. "I strive to be a complete environmental lawyer," he says.