David E. Marder

Daniel Halston focuses on securities litigation, general commercial litigation and administrative law disputes. He has represented numerous public and private high technology, life sciences, and financial services companies and their officers and directors in a wide range of complex litigation matters, including securities fraud class actions, derivative litigation, mergers and acquisitions disputes, false claims act actions, breach of fiduciary duty claims, investment advisor claims, closely...

David serves as Managing Partner and is a Tax Partner in Sullivan’s Boston office, bringing over 25 years of experience to his dual roles. Leadership Role As Managing Partner, David collaborates closely with the firm’s Management Committee, partners, and business professionals to advance Sullivan’s vision of becoming a leading global, commercially focused mid-size law firm. He is dedicated to: Cultivating a culture of deep loyalty and high performance Implementing innovative...

Miranda is a former federal prosecutor and experienced trial attorney who defends clients in government investigations and enforcement matters, including those involving health care fraud and abuse matters, and conducting internal corporate investigations. Miranda brings deep experience to her representation of pharmaceutical companies, medical device manufacturers, clinical laboratories, payors, pharmacies, health care providers, and other entities and individuals in federal criminal, civil ...

For over 25 years, Steven Ryan has practiced in the area of family law litigation, representing hundreds of clients involved in complex divorce matters. Mr. Ryan’s practice addresses all of the myriad issues that arise in the divorce setting: marital property division, inherited and gifted property, non-traditional compensation issues, business valuation, child support, child custody, alimony and the modification of previous awards of support. Complementing his experience as a trial adv...

John J. Cleary is a top attorney recognized by Best Lawyers in the practice area(s) of Employee Benefits (ERISA) Law and Litigation - ERISA. John J., who practices law in Boston, Massachusetts, has been recognized since 1987. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John J. is held by other top lawyers in the same geographic and legal practice area.

Leveraging her extensive and vast experience as a former Navy JAG and national security prosecutor, Stephanie specializes in handling high-stakes criminal and civil litigation matters, sensitive internal investigations, government enforcement proceedings and cyber-related incidents of all kinds. She is a litigation partner at Hinckley, Allen, & Snyder LLP and serves as the Chair of its Cybersecurity, Privacy, International Trade, and National Security Practice Groups and Co-Chair of its A...

Alex Mattera focuses his practice on all aspects of commercial bankruptcy, bankruptcy litigation, insolvency, business reorganization, and creditor and debtor rights. His representation includes secured creditors, with an emphasis on workouts and collection of troubled and defaulted loans, as well as creditors' committees, trustees, debtors, and other parties-in-interest in bankruptcy and related proceedings. He is a frequent panelist on behalf of the American Bankruptcy Institute, the Boston...

Katie focuses her practice on Real Estate Law , representing clients in a wide range of commercial real estate matters in Boston, Massachusetts and throughout the region. As an attorney with Sheehan Phinney Bass & Green PA , she advises businesses, developers, lenders, and investors on complex real estate transactions and day‑to‑day property matters. Her practice includes counseling clients on commercial real estate finance transactions, acquisitions, dispositions, and leasing arrangement...

Attorney Krysia Syska has been actively involved in numerous record-setting medical malpractice verdicts and settlements; many of which have been highlighted and featured in various publications from Massachusetts Lawyers Weekly and The Boston Globe to several national verdict reporting publications. Most recently, she participated in securing a $5 million settlement for birth injuries sustained when a nurse and midwife failed to act on signs of fetal distress. Attorney Syska joined the firm ...

Brenda S. Diana is a top attorney recognized by Best Lawyers in the practice area(s) of Trusts and Estates. Brenda S., who practices law in Boston, Massachusetts, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Brenda S. is held by other top lawyers in the same geographic and legal practice area.