About Us

Richard David Klein, Esq. joined the Diamond Law Group in 2002 while attending Touro College Jacob D. Fuchsberg Law Center, in Huntington, New York at night. He was admitted to practice law in New York in 2007, concentrating on transactional real estate law, including representation of buyers, sellers, and lenders. He has personally mentored most of our paralegals and attorneys, some without any previous legal experience, to become experts in the field. Mr. Klein also created an industry-standard interactive website allowing all involved parties to the transaction to log-in and follow along as their important transaction progresses.

Outside of work, Mr. Klein enjoys spending time with his wife Sarah, and three children, Matthew, Zoey and Dylan. He is a lifelong fan of the New Jersey Devils, Mets and Jets. Richard is also currently the Pack 776 Committee Chair, former PTA Vice President of Unqua Elementary School and volunteers as a DEK Hockey Coach.

Jonathan P. Bellezza, Esq is a 2013 graduate of Touro College Jacob D. Fuchsberg Law Center, in Central Islip, New York. He was admitted to practice law in New York in 2014 and is the newest partner at the firm as of 2017. His drive, professionalism, and attention to detail allowed him to make partner after just four years of working at Diamond Law Group. Mr. Bellezza now has a staff of three paralegals working at his direction and concentrates on transactional real estate law, including representation of buyers, sellers, and lenders.  Outside of work Mr. Bellezza enjoys cooking, exercising and spending time with his wife and three children, Jonathan, Joseph and Juliana.

Received his Bachelors of Science/Bachelor of Arts Degree from Georgetown University in 1983 and his Juris Doctor Degree from St. John’s University School of Law in 1993, and is admitted to practice law in both the state of New York and New Jersey, as well as the United States District Court, District of New Jersey and the Southern and Eastern Districts of New York.

Upon graduation from law school, Mr. Castiglione became associated with the Law Offices of Euclid F. Maggiani in Manhasset, New York, which concentrated its practice in the areas of general corporate law, real estate law, representation of individuals and lending institutions in commercial and residential real estate transactions, foreclosures, and trusts and estate planning.

While at the Law Offices of Euclid F. Maggiani, Mr. Castiglione supervised all real estate transactions, business sales, and corporate matters. He is the chief supervisor of all bank transactions and is responsible for all closings and the liason between each lender and the mortgage broker. Presently, he serves as a member of Ticor Title Guarantee’s Advisory Board.

Mr. Castiglione is a member of the New York State Bar Association, New Jersey State Bar Association, Nassau County Bar Association, Columbian Lawyers Association and American Bar Association.

Danielle Venturino joined Diamond law Group in July of 2020. She is a new graduate from hofstra university with a double major in criminology and psychology. She has future aspirations to attend law school and pursue a career as an attorney. During her free time she enjoys to draw / sketch, go to the beach, and cook new recipes.

Delia Young joined the Diamond Law Group team in 2015 as Richard Klein’s paralegal. She assists with all aspects of the firm’s residential real estate transactions. Delia received her bachelor’s degree from Stony Brook University with a major in Psychology and a minor in Political Science. She furthered her education at Hofstra University where she completed a paralegal certificate program and also hopes to attend law school in the near future. Delia is compassionate about animals and shares her new home with her two cats and her Bernese Mountain dog, Frankie.

Mitch is the Founder (retired) & General Counsel Emeritus of Diamond Law Group. Mr. Diamond has been practicing in the area of Residential Real Estate exclusively for 20 years.   His expertise has evolved over the past two decades through helping Buyers and Sellers navigate through their Home Purchases and Sales.   Coming from a restaurant background and integrating the same level of Customer service into the law business has led to his overwhelming success and popularity. Mitch also represents many of the Country’s most prominent Lenders.

Mitch is married with three children and loves to Travel and spend as much time as possible with his family.