J.M. O'Brien & Co. Employee Directory

Q: What is J.M. O'Brien & Co. known for?

J.M. O'Brien & Co. was founded in 1991. J.M. O'Brien & Co. operates in the Accounting industry.

Q: How many employees does J.M. O'Brien & Co. have currently?

J.M. O'Brien & Co. has approximately 9 employees.

AccountingMassachusetts, United States2-10 Employees

J.M. O'Brien & Company, PC was founded in October 1991 by John M. O'Brien. We service approximately 700 clients by providing auditing/accounting and tax services.
 
We provide auditing and accounting services to a wide range of clients in the following industries:
     * Not-for-profit
     * Financial service
     * Distribution 
     * Manufacturing
     * Retail 
     * Service
     * Transportation 

In addition, we provide other nontraditional services such as litigation support, budgeting and forecasting, outsourced internal audit services and specialized transactional consulting.

Find J.M. O'Brien & Co. employees' phone numbers or email addresses

J.M. O'Brien & Co. Global Highlights

North America
11

United States Of America
11

Asia
1

India
1

J.M. O'Brien & Co.'s Leadership

J. O.
President
Mobile Phone
Email
A. M.
Partner
Mobile Phone
Email
L. K.
Director, Trusts & Estates
Mobile Phone
Email
L. S.
Administration
Mobile Phone
Email
K. S.
Tax And Accounting Specialist
Mobile Phone
Email
M. C.
Audit Specialist
Mobile Phone
Email
M. L.
CPA
Mobile Phone
Email

J.M. O'Brien & Co. Employee Metrics

100%

50%

2026

2025

Accounting
Business
Administrative
Analytics
Arts & Design
Other

Contact profiles from J.M. O'Brien & Co.

Name

Title

Contact Info

Location

Last Update

J. O.
President
Mobile Phone
Email
United StatesMassachusetts
Aug 12, 2025
A. M.
Partner
Mobile Phone
Email
UNITED STATES
Aug 04, 2023
L. K.
Director, Trusts & Estates
Mobile Phone
Email
United StatesMassachusetts
Feb 19, 2026
L. S.
Administration
Mobile Phone
Email
United StatesMassachusetts
Aug 11, 2025
K. S.
Tax And Accounting Specialist
Mobile Phone
Email
UNITED STATES
Dec 30, 2023
M. C.
Audit Specialist
Mobile Phone
Email
Oct 23, 2024
M. L.
CPA
Mobile Phone
Email
United StatesMassachusetts
Oct 22, 2024

Frequently Asked Questions

What is J.M. O'Brien & Co. known for?

J.M. O'Brien & Co. was founded in 1991 operates in the Accounting industry. The company's main headquarters is located in 1350 Main Street One Financial Plaza 15th Floor Springfield, Massachusetts 01103 United States; you can contact the main corporate office by phone at

+1-413-733-****

. Explore J.M. O'Brien & Co.'s company overview page for more information.

What is J.M. O'Brien & Co.'s most common email format?

J.M. O'Brien & Co. employees' email format typically follows the pattern of . Trying to find reliable and up-to-date employee contact data? Find more J.M. O'Brien & Co. email formats with LeadIQ.

How many employees does J.M. O'Brien & Co. have currently?

J.M. O'Brien & Co. has approximately 9 employees as of March 2026. These team members are located across 2 continents, including North AmericaAsia.

Who are J.M. O'Brien & Co.'s key employees and leadership?

As of March 2026, J.M. O'Brien & Co.'s key employees include:

President: J. O.
Partner: A. M.
Director, Trusts & Estates: L. K.
Administration: L. S.
Tax And Accounting Specialist: K. S.

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