New York attorney record · Judicial Dept 3
Mark Robert O'Siochain
National University Ireland, Dublin alumna, admitted to the New York bar in 2006, registered office in Omaha, NE. This established record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2006
- Admitted
- 20
- Years in bar
- 4391439
- NY reg #
The record in one line
Mark Robert O'Siochain has held an active New York bar license for 20 years - admitted in 2006, longer-tenured than 51% of the state's currently-active attorneys.
- 20 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #25 of 58
- by tenure in Omaha office peers
- Law school
- National University Ireland, Dublin
Data updated August 2026
What this profile tells you
Bar status & tenure
Mark Robert O'Siochain carries New York bar registration 4391439, an established, active practitioner in good standing. Registration is recorded within Judicial Department 3, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Guinan O Siochain Law Group, located in Omaha, NE, ZIP 68114. Educational background: NATIONAL UNIVERSITY IRELAND, DUBLIN.
State context & due diligence
With an established practice on record, Mark Robert O'Siochain remains inside the New York bar's active cohort - see below for how that share of the register compares.
Experience vs. the active New York bar
Mark Robert O'Siochain was admitted in 2006, giving 20 years on the New York register.
20 years on the New York bar
Years since admission, all currently-active NY attorneys
20 Top 49% higher than 51% 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 Omaha, NE office peers
Against Omaha, NE's 58-attorney NY register cohort, Mark Robert O'Siochain lands at the 41st tenure percentile (rank #25). See the Omaha attorney directory .
- Local rank
- #25
- City cohort
- 58
- Local percentile
- 41st
- Admitted
- 2006
Nearest tenure peers in Omaha
- Alfredo Laurence Lobianco admitted 2006 · 20 yr
- David Keith Lutz admitted 2006 · 20 yr
- Brooke Harrison Mc Carthy admitted 2006 · 20 yr
- Paul Anthony Banks admitted 2007 · 19 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.
The 2006 admission class today
Of the 8,638 attorneys admitted to the New York bar in 2006, 66.6% are still "Currently registered" today, below the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4391439
- Year Admitted
- 2006 (20 yrs · senior)
- Judicial Department
- 3
- Next Registration
- Mar 2028
Location & Contact
- Company
- Guinan O Siochain Law Group
- City
- Omaha, NE
- ZIP Code
- 68114
- Phone
- (402) 783-1700
Education
NATIONAL UNIVERSITY IRELAND, DUBLIN
Status Distribution Across the New York Bar
Mark Robert O'Siochain'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 admission year (2006), other cities
NY-registered attorneys admitted in 2006 whose listed office city differs from Omaha, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Mark Robert O'Siochain: closest NY bar admission year outside NE, and closest out-of-state office cities by how many NY-registered attorneys they list (~59 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~2006)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
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Compare attorneys →Before you rely on this record
Mark Robert O'Siochain'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 O'Siochain licensed?
Mark O'Siochain is licensed to practice law in New York.
When was Mark Robert O'Siochain admitted to the bar?
Mark Robert O'Siochain was admitted to the bar in 2006.
Where did Mark Robert O'Siochain go to law school?
Mark Robert O'Siochain attended NATIONAL UNIVERSITY IRELAND, DUBLIN.
What company does Mark Robert O'Siochain work for?
Mark Robert O'Siochain is associated with Guinan O Siochain Law Group in Omaha, NE.
Is Mark Robert O'Siochain in good standing?
Yes, Mark Robert O'Siochain 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.