Skip to Content

William H. Kaiser


P: 212-338-9100
F: 646-607-9372

William H. Kaiser


For almost twenty-five years, William Kaiser has dedicated his practice to representing employees and professionals in employment discrimination cases and other employment litigation. Bill has represented individuals in employment disputes with some of the nation’s largest corporations and financial institutions.

Bill has successfully obtained numerous significant monetary settlements for his clients and has litigated groundbreaking cases that have resulted in published court decisions expanding the boundaries of employment protections in various aspects of employment law. He regularly litigates before courts and arbitration panels in cases involving claims of employment discrimination, sexual harassment, whistleblowing, breach of contract and non-payment of wages, bonuses and commissions. Bill also defends employees and executives in litigation alleging violations of non-compete and non-solicitation restrictions.

Bill has extensive experience representing victims of sexual harassment and sexual assault and currently represents multiple women with legal claims against the Estate of Jeffrey Epstein.


Bill’s recent client engagements include:

  • Successfully tried and obtained an arbitral award in favor of a financial services professional who was terminated and denied severance compensation earned over decades of service after being falsely accused of violating company policy.
  • Successfully tried and obtained an arbitral award in favor of an investment banker employed by a major Wall Street bank who was improperly denied his year-end bonus.
  • Successfully tried and obtained an arbitral award in favor of an investment banker, employed by a major Wall Street bank, who was improperly denied his deferred equity.
  • Obtained substantial settlement for an employee of a private equity firm that retaliated against her for objecting to sexual harassment she endured at the hands of one of its senior partners.
  • Won reversal of a summary judgment decision granted in favor of employer in a Sarbanes-Oxley Whistleblower case and then obtained a substantial settlement on the eve of trial.


  • Selected by Peer Review for Inclusion in Super Lawyers Directory, New York Metro, 2013-2020


“Dan and Bill Kaiser are the ultimate professionals and I would recommend them to anyone who needs representation and seeks justice.. From my first meeting with them they have provided me with clarity and sound advice. Their communication is exceptional and they are always available to answer any questions and respond to voicemails/e-mails/texts very quickly. They are both very personable and always make me feel at ease. They also don’t hide behind layers of staff so you always deal with them personally. Their experience, knowledge, qualifications and results speak for themselves.” – Senior Executive at Major League Soccer

“Dan and Bill Kaiser have not only been my lawyers through the entire litigation process but have also been my support system. I never feel alone and they have been there for me every step of the way to explain the process and fight with all their knowledge and power to help bring me closure. I cannot thank them enough.” – Survivor of sexual assault

“Dan and Bill Kaiser supported me at a time when I really needed help. They seemed as emotionally invested in the success of my case as I was. They made the entire process less arduous that I would have imagined.” – Investment banker at leading global bank

“Dan and Bill Kaiser set the bar in terms of employment litigation attorneys for both their professionalism and expertise. I had an incredibly complex and high-profile case that lasted almost 3 years. Dan and Bill worked overtime to bring it to a resolution. I have never had faith in the integrity of attorneys and the legal system until I met Dan and Bill. They are not only compassionate and courteous but exceptionally smart and tactful. In a world where corruption and politics plague justice, Dan and Bill work overtime for their clients. It is very clear that money is not the motivation for KSM – time and time again they have proven that they are committed to justice and transparency for their clients and will go above and beyond to ensure they have done everything to reach a positive outcome in their cases. When looking for attorneys for both high profile, and complicated cases it is important to find a firm with a track record of experience and KSM certainly delivers on that. I do not have enough gratitude and positive words for KSM and would recommend them for anyone looking for an employment and litigation attorney.” – Project Manager, cannabis industry


  • J.D., Brooklyn Law School, 1996
  • B.S., Cornell University School of Industrial and Labor Relations, 1992
    Phi Beta Kappa

Bar Admissions

  • New Jersey, 1996
  • New York, 1997

Court Admissions

  • U.S. District Court, District of New Jersey
  • U.S. District Court, Southern District of New York
  • U.S. District Court, Eastern District of New York

Professional Associations and Memberships

  • New York City Bar Association
  • New York State Bar Association, Labor and Employment Law Section
  • American Bar Association, Litigation Section