William Adam Mandelbaum, Business Attorney in Oyster Bay, New York
Over 45 years of legal practice · focused on Business, Criminal Defense, and Landlord/Tenant
MemberatW. Adam Mandelbaum
Oyster Bay, NY
Practicing business in Oyster Bay since 1981.
- 45+
- Years practicing
- 1
- Bar admission
Are you William Adam Mandelbaum?
This profile was built from public bar records and is still unclaimed. Claim it free to control your photo, bio, and fees — and get client inquiries sent straight to you.
Quick answer
William Adam Mandelbaum is a member based in Oyster Bay, NY. The practice focuses on Business, Criminal Defense, and Landlord/Tenant. William has over 45 years of legal experience. Currently practicing at W. Adam Mandelbaum.
- Based in
- Oyster Bay, NY
- Experience
- over 45 years
- Known for
- Business · Criminal Defense · Landlord/Tenant
- Handles Business, Criminal Defense, and Landlord/Tenant matters from Oyster Bay, NY.
- Over 45 years of practice as a licensed attorney.
About William Adam Mandelbaum: William Adam Mandelbaum is a member based in Oyster Bay, NY. The practice focuses on Business, Criminal Defense, and Landlord/Tenant. William has over 45 years of legal experience. Currently practicing at W. Adam Mandelbaum.
Areas of practice
William's practice areas in Oyster Bay
William concentrates on business, criminal defense, landlord/tenant, and litigation. Each area below outlines the kind of case William handles, typical outcomes to expect, and how the intake process starts.
Business
View other Business attorneys
Criminal Defense
View other Criminal Defense attorneys
Landlord/Tenant
View other Landlord/Tenant attorneys
Litigation
View other Litigation attorneys
Business cases in Oyster Bay, New York
William takes business matters in Oyster Bay, New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before William agrees to represent you.
Criminal Defense cases in Oyster Bay, New York
William takes criminal defense matters in Oyster Bay, New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before William agrees to represent you.
Landlord/Tenant cases in Oyster Bay, New York
William takes landlord/tenant matters in Oyster Bay, New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before William agrees to represent you.
Litigation cases in Oyster Bay, New York
William takes litigation matters in Oyster Bay, New York. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before William agrees to represent you.
Biography
William Adam Mandelbaum, business attorney serving Oyster Bay
William Adam Mandelbaum is a member based in Oyster Bay, NY. The practice focuses on Business, Criminal Defense, and Landlord/Tenant. William has over 45 years of legal experience. Currently practicing at W. Adam Mandelbaum. William works from Oyster Bay, New York and takes on business matters across the region.
William Adam Mandelbaum is a lawyer practicing criminal defense, landlord & tenant, business litigation and 2 other areas of law. William received a A.A. degree from Nassau College in 1976, and has been licensed for 45 years. William practices at W. Adam Mandelbaum in Oyster Bay, NY.
Working with William on a business matter
William Adam Mandelbaum is a lawyer practicing criminal defense, landlord & tenant, business litigation and 2 other areas of law. William received a A.A. degree from Nassau College in 1976, and has been licensed for 45 years. William practices at W. Adam Mandelbaum in Oyster Bay, NY.
Clients William works with
William reviews new inquiries case-by-case for business, criminal defense, and landlord/tenant matters in Oyster Bay and the surrounding New York area.
Credentials
Credentials — where William studied and practices
Hofstra University
J.D. · 1981
Nassau College
A.A. · 1976
Jurisdictions
William's state bar admissions
New York
1981 · ACTIVE
William studied at J.D. in Hofstra University and A.A. in Nassau College.
Law school and academic background
William completed J.D. in Hofstra University and A.A. in Nassau College. Formal legal training is one signal of substantive knowledge — the day-to-day practice William runs in New York is where that training gets applied to real client questions.
Locations
William Adam Mandelbaum's office in Oyster Bay
William's primary office is at 127 S. St., Ste. 1, Oyster Bay, NY, 11771. In-person meetings are by appointment; a phone intake usually comes first.
Client feedback
Client reviews of William Adam Mandelbaum
William has not yet collected verified client reviews on LawyersListed. Reviews here are all from confirmed clients; anonymous ratings are moderated out.
No reviews yet
Only verified clients who have consulted with William Adam Mandelbaum can leave a review.
Schedule your consultationHiring guide
How to hire William Adam Mandelbaum — what to expect in your first consultation
Working with a new business attorney should feel structured. Here's how the first two conversations with William usually go, from the moment you request a consult to the day representation begins.
Consultation formats and pricing
William charges for the initial consult. That fee is credited toward representation if you retain William's office.
What to bring to your first meeting
Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; William will tell you what matters and what doesn't.
Questions to ask a business attorney in Oyster Bay, New York
A short list to run through before you commit: How many business matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?
Fees & payment
Fees, payment methods, and consultation options for William
William discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in business practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every business matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. William confirms the model in the engagement letter before any work starts.
Payment methods and payment plans
William's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many business practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about William Adam Mandelbaum
How much does it cost to hire William for a business case?
Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. William walks through the likely range during the consult so there are no surprises.
Does William offer a free consultation?
William charges for the initial consult; that fee is credited toward representation if you retain William's office. Some business attorneys offer free consults — check William's current terms during booking.
How long do business cases in New York typically take?
Simple business matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. William gives a realistic estimate for your facts at the consult — vague answers here are a red flag.
Can William take my case if I'm outside Oyster Bay?
William is licensed in New York. Matters governed by New York law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — William will tell you if the case is a fit or refer you to someone closer to your court.
What should I bring to my first meeting with William?
Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. William will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.
Is William accepting new business clients right now?
William's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.
Areas served
Business attorneys serving Oyster Bay and Albany in New York
William handles business matters throughout New York. Each city below is a direct link into the search page for verified business attorneys in that community.
More counsel
Other top-rated business attorneys in New York
If William's intake is full or the fit isn't right, these business attorneys in Oyster Bay handle similar matters. Every profile below is verified and open to consultations.





