Sydney Tonsfeldt - Associate

New York
Tel: 212-486-2400
Fax: 212-486-3099
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Sydney Tonsfeldt focuses her practice on mass torts and commercial litigation.

Prior to joining Leader Berkon Colao & Silverstein, Sydney was associated with an AMLAW 100 firm, working in its Paris office.  She has experience drafting arbitration pleadings, handling contract negotiations and drafting on behalf of clients.  She has analyzed pre-litigation risk of contract breaches and performs due diligence for mergers and acquisitions.

She also previously interned for the ICC International Court of Arbitration in Paris, France.

Sydney is fluent in French.


  • Universite Paris I Pantheon-Sorbonne, LL.M., French, European and International Business Law (2015)
  • Washington University in St. Louis, J.D. (2015)
  • Agnes Scott College, B.A., magna cum laude, Phi Beta Kappa (2011)


  • New York