Colleran O'Hara & Mills L.L.P.

Over 60 Years of Service to the Labor Movement

About Us

Over 60 Years of Service to the Labor Movement

Colleran, O’Hara & Mills was founded by Richard L. O’Hara in 1963. Since then, the firm has represented labor organizations, their related fringe benefit funds, and individual union members, both in their employment and in private legal matters. As the complexity and needs of its clients has grown, the firm has kept pace in maintaining its status as an innovative and imaginative legal resource center for its clients. The firm takes great pride in the superior quality of its legal work and its commitment to servicing the legal needs of its clients. (In addition to the numerous individual recognitions earned by our attorneys, Colleran, O’Hara & Mills has an AV rating from the Martindale-Hubbel Legal Directory and a listing in its Bar Register of Preeminent Lawyers.)

Our History

Colleran, O’Hara & Mills L.L.P. has represented private and public sector Labor Unions since its inception in 1963. The firm’s history and tradition is rooted in the labor movement.

Our Firm

Colleran, O'Hara & Mills is a full service labor law practice, experienced and qualified to serve the legal needs that unions face today. The firm represents Labor Unions in all aspects of their dealings.

Our Practice Areas

Colleran O’Hara & Mills L.L.P. provides legal services in a variety of areas.

Labor Law

Labor law is a broad field covering labor-management relations and internal union issues in both the public and private sectors.


In addition to representing labor unions, COH&M represents Taft-Hartley employee benefit plans including pension, annuity, health, apprenticeship, and vacation.


At COH&M, our experience and dedication to each and every client is essential to our litigation practice.


Experience with Alternative Dispute Resolution is essential in the field of labor law, especially in contract enforcement.

Collective Bargaining

Collective bargaining is an essential component of effective labor representation.

Asbestos Litigation

COH&M works closely with Weitz & Luxenburg, P.C. to counsel and represent union members who have been exposed to asbestos.

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