Nancy B. G. Lassen

Nancy B. G. Lassen

Attorney Profile

Top Rated Employment & Labor Attorney in Philadelphia, PA

Willig, Williams & Davidson
 | 1845 Walnut Street, 24th Floor
Philadelphia, PA 19103
Phone: 215-656-3638
Selected to Super Lawyers: 2004 - 2006, 2008 - 2018
Licensed Since: 1985
Practice Areas:
  • Employment & Labor: Employee
Attorney Profile

Dedicated labor practitioner Nan Lassen is a partner in the Philadelphia office of Willig, Williams & Davidson. Nan has focused her practice on labor law with WWD since 1984.

Nan comes from a family with strong ties to labor: her father (a disabled veteran) was a Teamster, her mother was a UAW member, and her grandfather was a Steelworker. She has been a tireless and courageous advocate for working men and women for decades.  Working in industry since age 15, Nan developed a deep commitment to unions, and especially to worker safety and health.  On the front line advocating for workers long before she went to law school, Nan is a respected member of the labor law community as well as a professor of labor law.

After more than thirty years of practice as a union-side labor law attorney, Nan has a reputation as a tireless and tenacious advocate for labor organizations and workers in every sector of the workforce, including public employees (uniformed and non-uniformed), federal employees, private sector and industrial workers, transportation workers, and the building trades. Her extensive experience includes representing clients in collective bargaining, state and federal trial and appellate litigation, state and federal administrative agency proceedings, grievance and interest arbitrations, internal union proceedings and occupational health and safety disputes. Nan is also a sought-after speaker, educating union leaders and law students, workers and attorneys in matters such as employment discrimination, family and medical leave, occupational safety and health, effective advocacy and representation skills, fair labor standards and the rights and responsibilities of labor unions and union members.

Prior to joining the firm, Nan attended the University of Michigan, where she was inducted into the prestigious Phi Beta Kappa honor society. She graduated from Northeastern University School of Law. After law school, Nan was a NIOSH Fellow and received a Master of Science in Occupational Physiology, Safety and Health from Harvard University. Nan also clerked for Chief Judge George Clifton Edwards, Jr. on the United States Court of Appeals for the Sixth Circuit.  In addition to practicing law, Nan is also an adjunct professor of labor law at the Thomas R. Kline School of Law at Drexel University.

About Nancy Lassen

Admitted: 1985, Pennsylvania

Professional Webpage:

Honors and Awards:

  • Fellow, National Institute of Occupational Safety and Health, 1982
  • Who's Who in American Law, 1995-2009
  • AV Rated, Martindale-Hubbell
  • Best Lawyers in America, 2014-2017
  • Phi Beta Kappa

Bar/Professional Activity:

  • Pennsylvania Bar Association, 1984 - Present
  • Philadelphia Bar Association, Labor Committee Co-Chair, 1992
  • Philadelphia Bar Association, 1984 - Present
  • American Bar Association, 1981 - Present
  • AFL-CIO Lawyers Coordinating Committee, 1984 - Present

Representative Clients:

  • AFSCME, Communications Workers of America, Machinists Union, IAFF, Teamsters, Longshoremens' Union, IFPTE, United Food and Commercial Workers
  • AFSCME, Communications Workers of America, Machinists Union, IAFF, Teamsters, Longshoremens' Union, IFPTE, United Food and Commercial Workers

Other Outstanding Achievements:

  • Senior Law Clerk, Chief Judge George C. Edwards, United States Court of Appeals for the Sixth Circuit

Educational Background:

  • University of Michigan, Residential College, B.A., Phi Beta Kappa, 1978
  • Harvard University, M.S. (Occupational Physiology, Safety and Health), 1982
Office Location for Nancy B. G. Lassen

1845 Walnut Street
24th Floor
Philadelphia, PA 19103


Nancy B. G. Lassen:

Last Updated: 12/28/2017

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