New York attorney record · Judicial Dept 2
Mark Henry Lyon
Mississippi College School Of Law alumna, admitted to the New York bar in 2012, registered office in Washington, DC. This record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2012
- Admitted
- 14
- Years in bar
- 4978748
- NY reg #
The record in one line
Admitted in 2012, Mark Henry Lyon has built 14 years of active New York practice - more tenure than 25% of the state's currently-active attorneys.
- 14 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #7393 of 12,540
- by tenure in Washington office peers
- Law school
- Mississippi College School Of Law
Data updated August 2026
What this profile tells you
Bar status & tenure
Bar number 4978748 on the New York register belongs to Mark Henry Lyon, currently in active 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 Williams & Connolly LLP, located in Washington, DC, ZIP 20024. 5 other attorneys share this firm affiliation in the registry. Educational background: Mississippi College School of Law (41 registered alumni).
State context & due diligence
Mark Henry Lyon is currently part of the New York bar's active cohort, a group the breakdown below sizes against the full register.
Experience vs. the active New York bar
14 years into an active New York practice since a 2012 admission, Mark Henry Lyon sits here on the statewide experience curve - taller bars hold more attorneys at that experience level.
14 years on the New York bar
Years since admission, all currently-active NY attorneys
14 Top 75% higher than 25% of 290,787 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 · August 2026
Tenure among Washington, DC office peers
Mark Henry Lyon's 14-year NY register tenure places mid-pack in Washington, DC: rank #7,393 of 12,540 office peers (59th percentile). See the Washington attorney directory .
- Local rank
- #7,393
- City cohort
- 12,540
- Local percentile
- 59th
- Admitted
- 2012
Nearest tenure peers in Washington
- Jennifer Ann Abdella admitted 2012 · 14 yr
- James Tyler Adams admitted 2012 · 14 yr
- Mohammad Hasan Ali admitted 2012 · 14 yr
- Courtney Elise Alvarez admitted 2012 · 14 yr
How local rank is computed
Rank uses years since NY-bar admission among non-deceased registry rows that list the same office city and state, a local placement, not a statewide claim. Source: NY Office of Court Administration Attorney Registration · as of August 2026. Derived local rank, not published upstream.
Mississippi College School Of Law's active-bar rate
Of Mississippi College School Of Law's 41 alumni in the New York register, 85.4% currently hold "Currently registered" status, above the statewide average.
The 2012 admission class today
Of the 9,632 attorneys admitted to the New York bar in 2012, 69.6% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4978748
- Year Admitted
- 2012 (14 yrs · mid-career)
- Judicial Department
- 2
- Next Registration
- Oct 2026
Location & Contact
- Company
- Williams & Connolly LLP
- City
- Washington, DC
- ZIP Code
- 20024
- Phone
- (202) 434-5786
Education
Status Distribution Across the New York Bar
Mark Henry Lyon's current status, "Currently registered", places this attorney in the 67.2% of the 432,625-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.
Same firm affiliation: Williams & Connolly LLP
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure Mississippi College School Of Law alumni
Fellow alumni on the NY register whose admission year is closest to 2012 (excluding same-firm colleagues above).
Same admission year (2012), other cities
NY-registered attorneys admitted in 2012 whose listed office city differs from Washington, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Mark Henry Lyon: closest NY bar admission year outside DC, and closest out-of-state office cities by how many NY-registered attorneys they list (~12,541 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~2012)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
Verify This Attorney
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Compare attorneys →Before you rely on this record
Mark Henry Lyon'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 Mark Lyon licensed?
Mark Lyon is licensed to practice law in New York.
When was Mark Henry Lyon admitted to the bar?
Mark Henry Lyon has been on the New York bar register since 2012.
Where did Mark Henry Lyon go to law school?
Mark Henry Lyon attended Mississippi College School of Law.
What company does Mark Henry Lyon work for?
Mark Henry Lyon is associated with Williams & Connolly LLP in Washington, DC.
Is Mark Henry Lyon in good standing?
Yes, Mark Henry Lyon holds active bar status ("Currently registered").
Cite this page & disclosure
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.