
Peter P. Mackinnon, Probate Attorney in Locust Valley, New York
Over 51 years of legal practice · focused on Probate, Tax, and Trusts · 5.0/5 rating from 1 verified client review
PartneratHumes & Wagner, LLP
Locust Valley, NY
Practicing probate in Locust Valley since 1975.
- 51+
- Years practicing
- 5.0 ★
- 1 client review
- 2
- Bar admissions
Are you Peter P. Mackinnon?
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Quick answer
Peter P. Mackinnon is a partner based in Locust Valley, NY. The practice focuses on Probate, Tax, and Trusts. Peter has over 51 years of legal experience. Currently practicing at Humes & Wagner, LLP. Rated 5.0 out of 5 from 1 client review.
- Based in
- Locust Valley, NY
- Experience
- over 51 years
- Known for
- Probate · Tax · Trusts
- Handles Probate, Tax, and Trusts matters from Locust Valley, NY.
- Over 51 years of practice as a licensed attorney.
- Recognized with AV Preeminent.
About Peter P. Mackinnon: Peter P. Mackinnon is a partner based in Locust Valley, NY. The practice focuses on Probate, Tax, and Trusts. Peter has over 51 years of legal experience. Currently practicing at Humes & Wagner, LLP. Rated 5.0 out of 5 from 1 client review.
Areas of practice
Legal matters Peter takes on
Peter concentrates on probate, tax, and trusts. Each area below outlines the kind of case Peter handles, typical outcomes to expect, and how the intake process starts.
Probate cases in Locust Valley, New York
Peter takes probate matters in Locust Valley, 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 Peter agrees to represent you.
Tax cases in Locust Valley, New York
Peter takes tax matters in Locust Valley, 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 Peter agrees to represent you.
Trusts cases in Locust Valley, New York
Peter takes trusts matters in Locust Valley, 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 Peter agrees to represent you.
Biography
Meet Peter P. Mackinnon — probate lawyer in Locust Valley
Peter P. Mackinnon is a partner based in Locust Valley, NY. The practice focuses on Probate, Tax, and Trusts. Peter has over 51 years of legal experience. Currently practicing at Humes & Wagner, LLP. Rated 5.0 out of 5 from 1 client review.
Peter P. Mackinnon is a lawyer practicing trusts and estates, taxation, wills and probate. Peter received a B.S. degree from Clarkson College of Technology in 1970, and has been licensed for 51 years. Peter practices at Humes & Wagner, LLP in Locust Valley, NY.
Working with Peter on a probate matter
Peter P. Mackinnon is a lawyer practicing trusts and estates, taxation, wills and probate. Peter received a B.S. degree from Clarkson College of Technology in 1970, and has been licensed for 51 years. Peter practices at Humes & Wagner, LLP in Locust Valley, NY.
Who Peter represents
Peter reviews new inquiries case-by-case for probate, tax, and trusts matters in Locust Valley and the surrounding New York area.
Credentials
Education, bar admissions, and languages
St. John's University
J.D. · 1974
Clarkson College of Technology
B.S. · 1970
Jurisdictions
Peter's state bar admissions
Virginia
1981 · ACTIVE
New York
1975 · ACTIVE
Peter studied at J.D. in St. John's University and B.S. in Clarkson College of Technology.
Law school and academic background
Peter completed J.D. in St. John's University and B.S. in Clarkson College of Technology. Formal legal training is one signal of substantive knowledge — the day-to-day practice Peter runs in New York is where that training gets applied to real client questions.
Recognition
Recognition and thought leadership
Peter has received 1 formal recognition from bar associations, industry bodies, and peer-review services.
AV Preeminent
Legal awards and honors
AV Preeminent.
Locations
Peter P. Mackinnon's office in Locust Valley
Peter's primary office is at 147 Forest Avenue, Locust Valley, NY, 11560. In-person meetings are by appointment; a phone intake usually comes first.
Client feedback
Client reviews of Peter P. Mackinnon — 5.0/5 rating from 1 verified client review
Every review below is from a verified client of Peter. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing probate attorneys in Locust Valley.
5.0
1 client review
Client ratings are sourced from public records and editorial research. Reviews on LawyersListed are accepted from verified clients once Peter P. Mackinnon claims this profile.
Read all reviewsHiring guide
How to hire Peter P. Mackinnon — what to expect in your first consultation
Working with a new probate attorney should feel structured. Here's how the first two conversations with Peter usually go, from the moment you request a consult to the day representation begins.
Consultation formats and pricing
Peter charges for the initial consult. That fee is credited toward representation if you retain Peter'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; Peter will tell you what matters and what doesn't.
Questions to ask a probate attorney in Locust Valley, New York
A short list to run through before you commit: How many probate 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 Peter
Peter discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in probate practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every probate 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. Peter confirms the model in the engagement letter before any work starts.
Payment methods and payment plans
Peter's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many probate practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about Peter P. Mackinnon
How much does it cost to hire Peter for a probate case?
Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Peter walks through the likely range during the consult so there are no surprises.
Does Peter offer a free consultation?
Peter charges for the initial consult; that fee is credited toward representation if you retain Peter's office. Some probate attorneys offer free consults — check Peter's current terms during booking.
How long do probate cases in New York typically take?
Simple probate 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. Peter gives a realistic estimate for your facts at the consult — vague answers here are a red flag.
Can Peter take my case if I'm outside Locust Valley?
Peter 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 — Peter 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 Peter?
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. Peter will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.
Is Peter accepting new probate clients right now?
Peter's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.
Areas served
Probate attorneys serving Locust Valley and Albany in New York
Peter handles probate matters throughout New York. Each city below is a direct link into the search page for verified probate attorneys in that community.
More counsel
Other top-rated probate attorneys in New York
If Peter's intake is full or the fit isn't right, these probate attorneys in Locust Valley handle similar matters. Every profile below is verified and open to consultations.





