Atty. John Calder Mackay

Atty. John Calder Mackay

John Calder Mackay is a lawyer practicing business, corporate & incorporation, mergers & acquisitions. John received a B.S. degree from University of Southern California in 1971, and has been licensed for 52 years.

Billings Billings 52 yrs experience 52 year
Call (406) 540-1504 Book Appointment

Profile Summary

About John Calder Mackay at a glance

John Calder Mackay is an Irwin Home Equity based in Billings, Montana. They have 52+ years of legal experience, licensed to practice since 1974. Their practice focuses on formation, business, and m&a. Admitted to practice in California (1974). Educated at University of Southern California (J.D., 1974) and University of Southern California (B.S. University, 1971). Serands clients in Billings, MT and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Calder Mackay is a lawyer practicing business, corporate & incorporation, mergers & acquisitions
  • John received a B.S. degree from University of Southern California in 1971, and has been licensed for 52 years
  • John practices in Billings, MT

Practice Areas Explained

John Calder Mackay's Areas of Practice

Each practice area below reflects the types of cases John Calder Mackay handles, with a brief overview of what that area of law covers.

Business Formation

John Calder Mackay is one of 35,584 formation attorneys indexed nationally. Browse formation attorneys in Montana →

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

John Calder Mackay is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Montana →

Mergers & Acquisitions

John Calder Mackay is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in Montana →

Jurisdictional Context

Why local counsel matters in Montana

Practicing law in Montana. Legal matters in Montana are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Billings are typically filed in the local municipal court or the appropriate Montana state district court, depending on subject matter and amount in controversy. An attorney licensed in Montana brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Montana courts without local counsel or pro hac vice admission.

Looking for additional Montana attorneys? Browse all attorneys in Billings or all attorneys in Montana.

Frequently Asked

Common questions about John Calder Mackay

Where is John Calder Mackay's law office located?
John Calder Mackay's law practice is located in Billings, Montana. You can contact the office directly through this profile page.
What practice areas does John Calder Mackay handle?
John Calder Mackay focuses on formation, business, m&a. Each practice area listed reflects experience handling cases of that type in Montana.
How long has John Calder Mackay practiced law?
John Calder Mackay has 52+ years of legal experience and has been licensed since 1974.
Where did John Calder Mackay go to law school?
John Calder Mackay earned their education at (J.D., 1974); (B.S. University, 1971).
How can I contact John Calder Mackay for a consultation?
You can contact John Calder Mackay directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
University of Southern California
- 1974
B.S. University
University of Southern California
- 1971

Bar Admissions

California
Admitted: 1974

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