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Daniel O'Brien Email & Phone Number

Attorney at Halling & Cayo S.C. at Halling & Cayo S.C.

Location: Milwaukee, Wisconsin, United States 1 work role 2 schools

1 work email found @hallingcayo.com LinkedIn matched

✓ Verified Jun 2026 4 data sources Profile completeness 100%

Current company

Halling & Cayo S.C.

Role

Attorney at Halling & Cayo S.C.

Location

Milwaukee, Wisconsin, United States

Company size

29 employees

Who is Daniel O'Brien? Overview

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Quick answer

Daniel O'Brien is listed as Attorney at Halling & Cayo S.C. at Halling & Cayo S.C., a company with 29 employees, based in Milwaukee, Wisconsin, United States. AeroLeads shows a work email signal at hallingcayo.com and a matched LinkedIn profile for Daniel O'Brien.

Daniel O'Brien previously worked as Attorney at Halling & Cayo S.C.. Daniel O'Brien holds Doctor Of Law (Jd), Law from Marquette University Law School.

Company email context

Email format at Halling & Cayo S.C.

This section adds company-level context without repeating Daniel O'Brien's masked contact details.

*@hallingcayo.com

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AeroLeads found 1 current-domain work email signal for Daniel O'Brien. Compare company email patterns before reaching out.

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Profile bio

About Daniel O'Brien

Daniel O'Brien is a Attorney at Halling & Cayo S.C. at Halling & Cayo S.C.. He possess expertise in civil litigation, trials, litigation, legal writing, legal research and 4 more skills.

Listed skills include Civil Litigation, Trials, Litigation, Legal Writing, and 5 others.

Current workplace

Daniel O'Brien's current company

Company context helps verify the profile and gives searchers a useful next step.

Halling & Cayo S.C.

Attorney at Halling & Cayo S.C.

milwaukee, wisconsin, united states

Website

hallingcayo.com

Employees

29

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Company profile

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1 role

Daniel O'Brien work experience

A career timeline built from the work history available for this profile.

Attorney

Halling & Cayo S.C.

Team & coworkers

Colleagues at Halling & Cayo S.C.

Other employees you can reach at hallingcayo.com. View company contacts for 29 employees →

TS

Thomas Simon Colleague at Halling & Cayo S.C.Greater Milwaukee, United States View → MH

Michael H. Schaalman Colleague at Halling & Cayo S.C.Milwaukee, Wisconsin, United States, United States View → SC

Sherre Chevalier Colleague at Halling & Cayo S.C.Milwaukee, Wisconsin, United States, United States View → KM

Kurt Mueller Colleague at Halling & Cayo S.C.United States, United States View → MC

Michael Calkins Colleague at Halling & Cayo S.C.Greater Milwaukee, United States View → MM

Michael Mas Colleague at Halling & Cayo S.C.Jacksonville, Florida, United States, United States View → TC

Thomas Cunningham Colleague at Halling & Cayo S.C.Milwaukee, Wisconsin, United States, United States View → DK

Dorothy Kowalik-Wetzel Colleague at Halling & Cayo S.C.Milwaukee, Wisconsin, United States, United States View → JA

Jason Allen Colleague at Halling & Cayo S.C.St Francis, Wisconsin, United States, United States View → PB

Penny Bair Colleague at Halling & Cayo S.C.Pewaukee, Wisconsin, United States, United States View →

2 education records

Daniel O'Brien education

Doctor Of Law (Jd), Law

Marquette University Law School

Bachelor Of Arts (Ba), History, Political Science And Education

University Of Wisconsin-Milwaukee

FAQ

Frequently asked questions about Daniel O'Brien

Quick answers generated from the profile data available on this page.

What company does Daniel O'Brien work for?

Daniel O'Brien works for Halling & Cayo S.C..

What is Daniel O'Brien's role at Halling & Cayo S.C.?

Daniel O'Brien is listed as Attorney at Halling & Cayo S.C. at Halling & Cayo S.C..

What is Daniel O'Brien's email address?

AeroLeads has found 1 work email signal at @hallingcayo.com for Daniel O'Brien at Halling & Cayo S.C..

Where is Daniel O'Brien based?

Daniel O'Brien is based in Milwaukee, Wisconsin, United States while working with Halling & Cayo S.C..

What companies has Daniel O'Brien worked for?

Daniel O'Brien has worked for Halling & Cayo S.C..

Who are Daniel O'Brien's colleagues at Halling & Cayo S.C.?

Daniel O'Brien's colleagues at Halling & Cayo S.C. include Thomas Simon, Michael H. Schaalman, Sherre Chevalier, Kurt Mueller, and Michael Calkins.

How can I contact Daniel O'Brien?

You can use AeroLeads to view verified contact signals for Daniel O'Brien at Halling & Cayo S.C., including work email, phone, and LinkedIn data when available.

What schools did Daniel O'Brien attend?

Daniel O'Brien holds Doctor Of Law (Jd), Law from Marquette University Law School.

What skills is Daniel O'Brien known for?

Daniel O'Brien is listed with skills including Civil Litigation, Trials, Litigation, Legal Writing, Legal Research, Product Liability, Courts, and Personal Injury Litigation.

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