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Theresa M. Marchlewski

Los Angeles

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


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

See AllTheresa M. Marchlewski in the News

May 30, 2019
Jackson Lewis

Jackson Lewis Recommended in The Legal 500 2019

May 30, 2019

WHITE PLAINS, NY (May 30, 2019) Jackson Lewis P.C., one of the country’s preeminent workplace law firms, is pleased to announce the firm and its attorneys have been recommended in The Legal 500 United States 2019 in the following practice areas falling under the Labor and Employment designation: Employee Benefits, Executive Compensation... Read More

April 18, 2018
Jackson Lewis

Theresa M. Marchlewski and Leonora M. Schloss Honored as “Most Influential Women Attorneys" by Los Angeles Business Journal

April 18, 2018

LOS ANGELES, CA (April 18, 2018) Jackson Lewis P.C., one of the country’s preeminent workplace law firms, is pleased to announce Principals Theresa M. Marchlewski and Leonora M. Schloss have been recognized as two of Los Angeles’ “Most Influential Women Attorneys” by the Los Angeles Business Journal. The list honors 75 of the most... Read More

April 16, 2018
Los Angeles Business Journal

Theresa Marchlewski and Leonora Schloss Spotlighted on Most Influential Women Attorneys List

April 16, 2018

Theresa Marchlewski and Leonora Schloss are spotlighted on list of "Most Influential Women Attorneys," published by the Los Angeles Business Journal. Read More