Mesidor PLLC Files Arbitration Demand Against Morgan Stanley Alleging Workplace Discrimination and Retaliation
New York, NY — May 11, 2026 — Mesidor PLLC, a leading plaintiff-side employment law firm dedicated to combating workplace discrimination and harassment, issued the following statement regarding the recent dismissal of Waiguchu v. Morgan Stanley & Co. LLC, originally filed in the United States District Court for the Southern District of New York (Docket No. 25-CV-7443).
While the Court dismissed the case on the narrow procedural issue of whether the matter belongs in court or arbitration, the firm emphasizes that this decision does not address the merits of Ms. Waiguchu’s claims.
“Our client’s case has always been about accountability for a deeply troubling workplace experience,” said Marjorie Mesidor, Founder and Chief Visionary of Mesidor PLLC. “While we are disappointed with the Court’s decision on this limited issue of forum, we remain fully confident that, regardless of where this case is heard, the evidence will demonstrate the hostile work environment Ms. Waiguchu endured.”
Ms. Theresa Waiguchu, current Vice President at Morgan Stanley, alleges that she was subjected to a pattern of discrimination, retaliation, and failure to accommodate her disability during her employment. The complaint details allegations of race, gender, and disability discrimination, as well as retaliation for reporting misconduct and exercising her legal rights.
According to the complaint, Ms. Waiguchu experienced ongoing workplace hostility, including discriminatory treatment by supervisors, retaliation following internal complaints, and adverse employment actions tied to her use of protected leave and accommodation requests.
Mesidor PLLC confirms that the case will now proceed in arbitration, where the firm intends to continue aggressively advocating on behalf of Ms. Waiguchu.
“We look forward to presenting Ms. Waiguchu’s claims before a finder of fact and securing full and fair compensation for the harm she has suffered,” said Alexandria Jean-Pierre, Senior Associate at Mesidor PLLC. “A change in venue does not change the truth.”
“I came forward because of what I experienced, and I’m committed to seeing this through,” said Ms. Waiguchu. “I brought this lawsuit to show others that you can advocate for yourself when you have been subjected to a hostile working environment. I’m grateful to have a legal team that believes in my case and continues to fight for me.”
Mesidor PLLC remains committed to holding employers accountable and advancing its mission to eliminate workplace discrimination through litigation, advocacy, and public awareness.
About Mesidor PLLC
Mesidor PLLC is a boutique law firm representing employees in matters involving workplace discrimination, sexual harassment, retaliation, and misconduct. The firm is committed to empowering individuals and driving systemic change in workplace culture.
Media Contact
Briana Willis
Impact and Engagement Strategist
Mesidor PLLC
bw@marjoriemesidor.com
631-759-5561