Every new administration loses people. Some depart quietly as planned transitions. Others leave loudly, under pressure, or in scandal. In Mayor Mamdani's first 100 days, five senior officials resigned. Each one tells a different story about how this administration is actually running.
Here's the full breakdown →
Who Left?
1. Robert Tucker — FDNY Commissioner
Resigned: December 19, 2025
Tucker resigned the day after Mamdani won the mayoral election, weeks before the inauguration. He was an Adams-era appointee and cited "fundamental ideological differences" with the incoming administration. No attempt to bridge the gap. He was replaced by Lillian Bonsignore, the first woman to lead FDNY in the department's 160+ year history.
What it tells us: Mamdani isn't inheriting a pre-negotiated handoff. Holdovers who don't align are leaving on their own, and the replacements signal intent — Bonsignore's appointment was simultaneously a clean break and a history-making first.
2. Catherine Almonte Da Costa — Director of Mayor's Office of Appointments
Resigned: December 31, 2025
Da Costa resigned one day after her appointment. Antisemitic social media posts from 2011-2012 surfaced — references to "money hungry Jews" and other tropes. The mayor accepted the resignation and apologized for inadequate vetting.
What it tells us: The vetting process at the top of the administration wasn't ready for prime time. The incoming mayor — who had spent the entire campaign defending himself against antisemitism accusations — named his head of appointments without a social media audit. The mistake was caught within 48 hours. But the obvious question remained: what else wasn't caught?
3. Javier Lojan — Acting Commissioner, Sanitation
Resigned: January 1, 2026
Lojan was a bureaucratic transition, not a controversy. He had been serving as Acting Commissioner. When Gregory Anderson was appointed permanent Commissioner, Lojan stepped aside. Clean. Expected. Unremarkable.
What it tells us: Some departures are just the machinery working. Worth tracking only because the full picture requires counting every exit — not just the loud ones.
4. Jocelyn Strauber — DOI Commissioner
Resigned: January 16, 2026
Strauber led the Department of Investigation during its probe and indictment of Mayor Adams. She was asked to continue in an interim role after Mamdani took office, then resigned two weeks later, stating "continuing in an interim role is not feasible" given DOI's independence requirements.
What it tells us: DOI operates on a different logic than the rest of the administration. It has to. Strauber's departure highlighted the structural tension in how DOI is staffed — and set up the controversy that followed. Her replacement, Nadia Shihata, is now the subject of Council scrutiny over her $700 donation to Mamdani's campaign and her role canvassing for him. That controversy is ongoing.
5. Zachary Iscol — Emergency Management Commissioner
Resigned: February 11, 2026
Iscol had led Emergency Management for three-plus years under Adams. He agreed to stay on as interim through the snow season at Mamdani's request — a quiet professional handoff. Christina Farrell replaced him.
What it tells us: Not everything is confrontational. The administration can do continuity when it wants to, particularly in agencies where operational stability matters more than ideological alignment. The Iscol handoff is what a normal transition looks like.
The Pattern
Five resignations in 100 days isn't unusual. The pattern underneath is what matters.
Two were clean handoffs (Lojan, Iscol). One was a holdover breaking alignment (Tucker). One was a vetting failure (Da Costa). One was structural — a conflict between political transition and DOI's independence — and it set up one of the administration's biggest active controversies (Strauber → Shihata).
Only one exit — Da Costa — landed as a scandal in the traditional sense. That's low by historical standards. But the Shihata nomination means the DOI story isn't over. It's just begun.
We're tracking all 73 officials — 68 active, 5 resigned — and every transition in between.
Takeaways:
The Count 5 senior officials resigned in Mamdani's first 100 days. 2 clean handoffs, 1 ideological exit, 1 vetting failure, 1 structural conflict.
The Only Scandal Catherine Almonte Da Costa resigned within 48 hours of appointment after antisemitic social media posts surfaced. A vetting failure caught fast — but it raised the "what else?" question.
The One That Keeps Going: Jocelyn Strauber (DOI) left-over independence concerns. Her replacement, Nadia Shihata — a Mamdani donor and canvasser — is now under Council scrutiny. The DOI story is the sleeper controversy of Term 1.
The Quiet Handoffs Lojan (Sanitation) and Iscol (Emergency Management) left through normal bureaucratic transitions. Not every exit is news.
What It Signals: Mamdani isn't inheriting a negotiated coalition. Holdovers who don't align are leaving on their own. The replacements — Bonsignore, Farrell, Shihata — define his actual governing team.
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Go Deeper Four reads on the personnel shake-up
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