New York attorney record · Judicial Dept 4
Holly Danielle Mergenhagen
Case Western Reserve University alumna, admitted to the New York bar in 2012, registered office in Williamsville, NY. This record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2012
- Admitted
- 14
- Years in bar
- 5049234
- NY reg #
The record in one line
Admitted in 2012, Holly Danielle Mergenhagen has built 14 years of active New York practice - more tenure than 24% of the state's currently-active attorneys.
- 14 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- Top 76%
- by tenure among active NY attorneys
- Law school
- Case Western Reserve University
Data updated May 2026
What this profile tells you
Bar status & tenure
Bar number 5049234 on the New York register belongs to Holly Danielle Mergenhagen, currently in active standing. Registration is recorded within Judicial Department 4, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Seneca Holdings LLC, located in Williamsville, NY (Erie County), ZIP 14221. Educational background: CASE WESTERN RESERVE UNIVERSITY (329 registered alumni).
State context & due diligence
Holly Danielle Mergenhagen 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, Holly Danielle Mergenhagen 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 76% higher than 24% 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 Holly compares to fellow Case Western Reserve University alumni
Among the 234 Case Western Reserve University graduates in the New York register, Holly Danielle Mergenhagen is longer-tenured than 6% - a school-cohort view of experience, alongside the statewide one above.
14 years vs. Case Western Reserve University alumni
Years since admission - 234 NY-registered alumni of this school
14 Top 94% higher than 6% of 234 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
Case Western Reserve University's active-bar rate
Of Case Western Reserve University's 329 alumni in the New York register, 72% currently hold "Currently registered" status, above the statewide average.
Case Western Reserve University alumni, active-bar rate
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
- 5049234
- Year Admitted
- 2012 (14 yrs · mid-career)
- Judicial Department
- 4
- Next Registration
- Jun 2026
Location & Contact
- Company
- Seneca Holdings LLC
- City
- Williamsville, NY
- County
- Erie
- ZIP Code
- 14221
- Phone
- (716) 250-9389
Education
Status Distribution Across the New York Bar
Holly Danielle Mergenhagen'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.
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Compare attorneys →Before you rely on this record
Holly Danielle Mergenhagen'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 Holly Mergenhagen licensed?
Holly Mergenhagen is licensed to practice law in New York.
When was Holly Danielle Mergenhagen admitted to the bar?
Holly Danielle Mergenhagen has been on the New York bar register since 2012.
Where did Holly Danielle Mergenhagen go to law school?
Holly Danielle Mergenhagen attended CASE WESTERN RESERVE UNIVERSITY.
What company does Holly Danielle Mergenhagen work for?
Holly Danielle Mergenhagen is associated with Seneca Holdings LLC in Williamsville, NY.
Is Holly Danielle Mergenhagen in good standing?
Yes, Holly Danielle Mergenhagen 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.