Our Team

Joshua Marks

Josh Marks

A trusted advisor in the real estate and business law arenas, Joshua M. Marks provides legal counsel in commercial real estate and business ventures to entrepreneurs, companies, developers and investment firms. Known best for his responsiveness, hands-on approach and ability to close transactions seamlessly, Josh has quickly risen to become one of the Delaware Valley’s most sought out real estate and business law attorneys.


Josh embarked upon his legal career after completing a college internship assisting a Philadelphia Municipal Court judge. During that time, Josh truly gained an appreciation of, and developed a passion for law. After graduating from the Pennsylvania State University, Josh attended the Widener University School of Law in Wilmington, Delaware graduating Cum Laude in 1997. Over the course of the years that followed, Josh came to find his niche in the transactional world of business and real estate law.

Josh founded JM LAW GROUP, LLC, in 2009 with the mission to concentrate in business and commercial real estate transactions on behalf of entrepreneurs, small business owners, medical/dental professionals and investors. Prior to that time, he was a partner at a boutique law firm in Philadelphia; and even earlier in his career, Josh was a sole practitioner focusing in real estate law, business law and criminal defense. He spent the first two years of his career as an associate at the Lutz & LeVow and Hark & Hark law firms.

Josh has negotiated employment and marketing contracts for NFL players, structured the sale of an industry-leading online company to a Canadian venture capital firm and has counseled numerous investors, professionals, business owners and entrepreneurs in the purchase, sale, lease and refinance of hotels, strip-centers, apartment buildings, medical and dental practices, and restaurant and retail establishments.


One of Josh’s best attributes is his ability to communicate in such a way as to help bring all parties to the closing table. He possesses the finesse to navigate heated issues with ease and maintains his poise and composure while fighting for his clients’ best interests. Josh’s keen eye for the details of a negotiation and ability to adapt to all personality types makes his skill set invaluable during the course of his clients’ transactions.

Josh currently resides in Lafayette Hill, Pennsylvania with his wife and children.

Beth Rosenthal

Beth Mandel Rosenthal


Before joining the team, Beth Mandel Rosenthal practiced commercial litigation and represented clients in class action lawsuits. Since joining the firm, she focuses on helping people achieve their dreams, primarily with FDD, Franchise Agreement and commercial lease reviews and negotiation.


Beth focuses on helping small-time business owners and first-time business purchasers understand the FDD and Franchise Agreement. She is a pro at breaking down and negotiating complicated commercial leases, which are designed to favor the landlord. Her knack for understanding the fine print ensures that her clients are protected for the future.


Beth enjoys helping small business owners accomplish their dreams, whether that be a high-powered executive quitting her job to open a yoga studio or an ambitious young entrepreneur looking to start a sandwich shop or smoothie franchise. For Beth, the best part of her job is getting involved in the excitement of working with small business owners who are looking forward to the future.

Memorable Experience:

Beth worked with a client who was opening a healthy fast-casual franchise that incorporated local produce and healthy options into a casual dining atmosphere. The client was set on growing an organic vegetable garden on the outside of the property, so she could incorporate fresh herbs and other produce into the menu. Unfortunately, the business was in an upscale shopping center so having the landlord sign off on that seemed close to impossible. After some negotiation, the vegetable garden made it into the lease and the garden was planted! The business has since grown and is opening its fourth location with Beth’s help and guidance.

When Beth isn’t working she enjoys spending time with family, which includes taking skiing trips out West. She even gets to watch her kids compete in ski racing. Beth likes staying active, which includes cycling outdoors and trying out some new workout classes.

Michael Mirsky

Michael Mirsky


Michael started working as the Senior Real Estate Counsel for David’s Bridal when it was a small startup retailer. As the company grew to become the nation’s largest bridal retailer, Michael took on the role of Vice President of Real Estate. As a key contributor to the company’s expansion, he gained extensive experience in national and international growth strategy, portfolio management, and location intelligence.

Michael later used his expertise to start his own real estate consulting company—helping retail clients assess, plan, and implement real estate growth strategies, as well as assisting landlords in analyzing potential commercial development opportunities.


As an expert in real estate law, Michael is the guy to go to if you need to negotiate a retail/commercial lease. With 500+ lease negotiations under his belt, he will make sure your agreements are promptly reviewed and thoroughly negotiated.


Michael’s approach is firm, but fair, never losing sight of his clients’ business objectives. His diverse experience working with national, regional, and startup brands as well as the entire spectrum of landlords has made him an adaptable force in the industry.

Proud Moments:

Michael attributes his professional growth to the years he dedicated expanding David’s Bridal. He has successfully executed deals in all 50 states, Canada, and the UK.

When he’s not traveling the world (or giving legal advice), Michael enjoys spending time with his wife and two daughters.

Andrew Slom

Andrew Slom


Andrew was born and raised in Lawrenceville, New Jersey.  Following high school, he attended Providence College where he received his Bachelor of Arts degree in Political Science and was a member of Pi Sigma Alpha, the National Political Science Honor Society.

Following undergraduate school, Andrew attended Rutgers Law School in Camden, New Jersey, where he was a member of the Rutgers Journal of Law and Public Policy, and President of the Labor and Employment Law Society. Upon completion of his law degree, Andrew served as a judicial law clerk for the Honorable Nan S. Famular, P.J.Ch.


In the fall of 2015, Andrew entered private practice, where he has since focused primarily on real estate, business and franchise related transactions. Andrew regularly provides strategic and thorough counsel in the acquisition and sale of commercial real estate, acquisition and sale of businesses including franchises, and the review of Franchise Disclosure Documents. He has the ideal temperament for navigating transactions and has a keen eye for detail.

Andrew currently serves as the Vice Chair of the Philadelphia LGBTQ Bar Association.  In his spare time, he enjoys playing golf, going to the theater, traveling and spending time with his family and friends.

Josh Marks and team walking in hallway

Ready to Talk?

JM LAW GROUP has a team of legal professionals to assist in your next transaction, but each new relationship starts with an introductory call to understand your needs.