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Theresa M. Marchlewski

Los Angeles

P 213-689-0404 F 213-689-0430


Theresa M. Marchlewski


Theresa M. Marchlewski is a Principal in the Los Angeles, California, office of Jackson Lewis P.C. She has over 25 years of experience in all phases of employment and commercial litigation both jury and non-jury in the state and federal courts, handling age, disability, gender, national origin and race discrimination, sexual harassment and wrongful termination claims.

Ms. Marchlewski has significant expertise in Sarbanes Oxley, ERISA and trade secret litigation, and matters involving bank operations, mortgage banking, broker dealer and commercial litigation, unfair competition and real estate. Ms. Marchlewski has significant expertise and experience in the electronic discovery process, having developed and implemented e-discovery guidelines and protocols to insure business understanding and compliance with electronic discovery obligations.

Ms. Marchlewski has handled numerous wrongful termination, harassment and employment discrimination claims in the financial services, broker dealer and insurance brokerage context. She has had significant exposure in class-action and California Business & Professions Code Section 17200 claims and argued the Cortez v. Purolator Air Filtration Prods. Co., Section 17200 case before the California Supreme Court.

Ms. Marchlewski has extensive experience arbitrating employment disputes pursuant to employment arbitration agreements as well as defending employers in judicial and FINRA arbitrations. She has personally handled or supervised dozens of cases before the American Arbitration Association in California and other states. She also has regularly handled both judicial and private employment dispute mediations on behalf of employers.

Prior to joining Jackson Lewis in 2009, Ms. Marchlewski was an Assistant General Counsel for Washington Mutual Bank managing and overseeing the company’s employment and banking litigation in the Southwest, West and Midwest. She is a frequent lecturer at national legal education seminars on various litigation topics.

Honors and Recognitions

  •  Los Angeles Business Journal, "Most Influential Women Attorneys" (2018)
Theresa M. Marchlewski
Rated by Super Lawyers

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The Legal 500 – The Clients Guide to Law Firms

Professional Associations and Activities

  • State Bar of California
  • Defense Research Institute, Former Board of Directors Member and Past Chair of the Commercial Litigation and Corporate Counsel committees

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