Abraham "Abe" Leitner

Alan S. Waldenberg is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. Alan S., who practices law in New York, New York, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Alan S. is held by other top lawyers in the same geographic and legal practice area.

Claude M. Millman is a former Assistant United States Attorney (S.D.N.Y.) and New York City government contracting chief who litigates complex commercial disputes; advises clients on government procurement and contracting, land use, and environmental issues; and handles internal investigations and white-collar defense. Formerly a partner at Proskauer Rose LLP, Mr. Millman joined Kostelanetz LLP in 2011. Mr. Millman came to Kostelanetz to lead the firm's commercial civil litigation efforts. He...

Daniel Gildin is a top attorney recognized by Best Lawyers in the practice area(s) of Franchise Law. Daniel, who practices law in New York, New York, has been recognized since 2008. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Daniel is held by other top lawyers in the same geographic and legal practice area.

William C. Silverman is a top attorney recognized by Best Lawyers in the practice area(s) of Criminal Defense: White-Collar. William C., who practices law in New York, New York, has been recognized since 2019. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which William C. is held by other top lawyers in the same geographic and legal practice area.

Frank Floriani is a member of the firm and leads Sullivan Papain’s Product Liability and Complex Litigation department. A highly effective and deeply experienced litigator, Mr. Floriani takes pride in helping clients who are in the midst of challenging and often life-altering circumstances. His efforts have helped those clients recover tens of millions of dollars in verdicts and settlements. Mr. Floriani’s skills cross a broad legal spectrum, and he has guided an array of litigati...

Jay E. Rivlin has extensive experience advising ultra-high net worth individuals and families on all aspects of their personal legal needs, including domestic and international estate, gift and tax planning, administration, cross-border issues, and controversy resolution; family office administration; business succession planning; family dispute resolution; charitable giving and private foundation administration; acquisition and ownership of private aircraft; as well as guardianship and plann...

Christine A. Okike is a top attorney recognized by Best Lawyers in the practice area(s) of Bankruptcy and Creditor Debtor Rights / Insolvency and Reorganization Law. Christine A., who practices law in New York, New York, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Christine A. is held by other top lawyers in the same geographic and legal practice area.

Repeatedly recognized as a leader in the real estate sector, Samuel Ross has negotiated and structured some of the most complex and significant commercial property acquisitions, ground leases, and sales throughout the country. Sam represents sellers and purchasers of major office buildings, mixed-use facilities, apartment complexes, hotels, and retail establishments, as well as landlords and tenants in negotiating, drafting and enforcing office, retail, restaurant and garage leases. Both grou...

Timothy Klimpl, of counsel with Tannenbaum Helpern’s Employee Benefits and Executive Compensation practice, is also a member of the Firm’s Tax and Employment Law teams. Tim provides ERISA advice and related services to a variety of plan sponsors on employee benefit plans, including corporate, nonprofit, and governmental plans providing retirement, health, and other employee welfare benefits. Tim also advises employers and senior-level employees in M&A transactions in equity an...

Howard Schiffman is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation and Litigation - Securities. Howard, who practices law in New York, New York, has been recognized since 2007. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Howard is held by other top lawyers in the same geographic and legal practice area.