New York attorney record · Judicial Dept 2
William Peter Mahon
University Of Dayton alumna, admitted to the New York bar in 1980, registered office in West Chester, PA. A half-lifetime's worth of status, address, and registration history on this record come straight from the NY Office of Court Administration.
- 1980
- Admitted
- 46
- Years in bar
- 1678184
- NY reg #
The record in one line
William Peter Mahon has spent 46 years on the register since admission in 1980, one of the longest-standing active practitioners the state bar carries at 92% tenure percentile.
- 46 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- Top 8%
- by tenure among active NY attorneys
- Law school
- University Of Dayton
Data updated May 2026
What this profile tells you
Bar status & tenure
William Peter Mahon has carried New York bar registration 1678184 for the better part of a career, still active and in good standing. Registration is recorded within Judicial Department 2, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Chester County Justice Center, located in West Chester, PA, ZIP 19380. Educational background: UNIVERSITY OF DAYTON (206 registered alumni).
State context & due diligence
Across a career spanning 46 years, William Peter Mahon has remained part of the New York bar's active cohort, a share of the register detailed further below.
Experience vs. the active New York bar
William Peter Mahon's 46 years since a 1980 admission places this record near the far edge of the statewide tenure curve below.
46 years on the New York bar
Years since admission, all currently-active NY attorneys
46 Top 8% higher than 92% of 284,296 active NY attorneys
Each bar is a band; taller bars hold more active NY attorneys. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NY Office of Court Administration, Attorney Registration · May 2026
How William compares to fellow University Of Dayton alumni
Among the 150 University Of Dayton graduates in the New York register, William Peter Mahon is longer-tenured than 99% - a school-cohort view of experience, alongside the statewide one above.
46 years vs. University Of Dayton alumni
Years since admission - 150 NY-registered alumni of this school
46 Top 1% higher than 99% of 150 fellow alumni
Each bar is a band; taller bars hold more fellow alumni. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NY Office of Court Administration, Attorney Registration · May 2026
University Of Dayton's active-bar rate
Of University Of Dayton's 206 alumni in the New York register, 68.6% currently hold "Currently registered" status, above the statewide average.
University Of Dayton alumni, active-bar rate
The 1980 admission class today
Of the 4,659 attorneys admitted to the New York bar in 1980, 53.7% are still "Currently registered" today, below the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 1678184
- Year Admitted
- 1980 (46 yrs · veteran)
- Judicial Department
- 2
- Next Registration
- Oct 2026
Location & Contact
- Company
- Chester County Justice Center
- City
- West Chester, PA
- ZIP Code
- 19380
- Phone
- (610) 344-6180
Education
Status Distribution Across the New York Bar
William Peter Mahon's current status, "Currently registered", places this attorney in the 66.2% of the 429,620-attorney New York register currently marked active.
Full statewide breakdown & source note
Source: NY Office of Court Administration, Attorney Registrations. Status counts reflect the latest reporting cycle. Bar status confirms registration only; it does not imply competence, specialty fit, or freedom from complaints.
Verify This Attorney
Verify on NY Courts Attorney SearchNearby Attorneys in West Chester, PA
Compare credentials side-by-side
Compare William Peter Mahon with similar attorneys in West Chester.
Compare attorneys →Before you rely on this record
William Peter Mahon's "Currently registered" listing confirms bar standing only, it is a registration fact to verify, not a verdict on quality or competence.
Frequently Asked Questions
Where is William Mahon licensed?
William Mahon is licensed to practice law in New York.
When was William Peter Mahon admitted to the bar?
William Peter Mahon's admission to the New York bar dates back to 1980.
Where did William Peter Mahon go to law school?
William Peter Mahon attended UNIVERSITY OF DAYTON.
What company does William Peter Mahon work for?
William Peter Mahon is associated with Chester County Justice Center in West Chester, PA.
Is William Peter Mahon in good standing?
Yes, William Peter Mahon holds active bar status ("Currently registered").
Sourced from the NY Office of Court Administration, informational only, not legal advice. Full disclosure.
Read our methodology - how this data is sourced, computed, and verified.