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    John McMackin photograph

    John P. McMackin

    Associate

    Gulfport
    228-679-1333
    john.mcmackin@phelps.com
    Areas Of Focus
    AppellateInsuranceCommercial Litigation

    John McMackin is a Mississippi appellate lawyer who helps insurers, businesses and contractors resolve high-stakes appeals, trials, and complex disputes. A former judicial law clerk at the Supreme Court of Mississippi, the Fifth Circuit and the U.S. District Court for the Southern District of Mississippi, John draws on firsthand insight into judicial decision-making to develop focused arguments, preserve issues for appeal and position cases for effective appellate review.  His appellate perspective also informs his work at the trial court level. In addition to litigating cases through trial, John advises clients on dispositive and post-trial motions, error preservation and other issues that can affect appellate review.

    At trial and on appeal, John regularly represents insurers and insureds in coverage and defense disputes involving the duty to defend and indemnify, reservations of rights, waiver and estoppel and declaratory judgment actions. He also handles commercial, transportation and casualty claims.

    His work for insurers and businesses frequently extends into commercial and construction disputes. John handles contract and business tort claims, restrictive covenants, arbitration and construction matters involving payment, liens, bonds, delays and defects. His experience also includes builder’s risk and CGL coverage disputes and litigation under 42 U.S.C. § 1983, Title VII and the Mississippi Tort Claims Act.

    Insights

    • August 20, 2026

      Best Lawyers: Ones to Watch Spotlights the Next Generation of Talent at Phelps…

    • February 17, 2026

      Phelps Wins Four Fifth Circuit Appellate Rulings to Start 2026 …

    More +
    • November 20, 2025

      Super Lawyers Honors 22 Phelps Attorneys on 2025 Mid-South Lists …

    Recognition

    • Appellate Practice (2027), Commercial Litigation (2027), Litigation - Labor and Employment (2027), The Best Lawyers in America: Ones to Watch 
    • Top 10 Leader Under 40, Mississippi Gulf Coast Chamber of Commerce (2026)
    • Mid-South Rising Stars list, Super Lawyers (2025)
    • Appellate Practice (2027), Commercial Litigation (2027), Litigation - Labor and Employment (2027), The Best Lawyers in America: Ones to Watch 
    • Top 10 Leader Under 40, Mississippi Gulf Coast Chamber of Commerce (2026)
    • Mid-South Rising Stars list, Super Lawyers (2025)

    Education

    • Indiana University Maurer School of Law, J.D., magna cum laude, Order of the Coif, 2019
    • University of Notre Dame, B.A., History & Theology, cum laude, 2016
    • Indiana University Maurer School of Law, J.D., magna cum laude, Order of the Coif, 2019
    • University of Notre Dame, B.A., History & Theology, cum laude, 2016

    Credentials

    • Mississippi
    • U.S. Court of Appeals for the Fifth Circuit
    • U.S. Court of Appeals for the Federal Circuit
    • U.S. District Court, Southern District of Mississippi
    • U.S. District Court, Northern District of Mississippi
    • Judicial Law Clerk for Hon. Taylor B. McNeel, U.S. District Court, Southern District of Mississippi
    • Judicial Law Clerk for Hon. Cory T. Wilson, U.S. Court of Appeals for the Fifth Circuit
    • Judicial Law Clerk for Hon. Michael K. Randolph, Mississippi Supreme Court
    • Mississippi
    • U.S. Court of Appeals for the Fifth Circuit
    • U.S. Court of Appeals for the Federal Circuit
    • U.S. District Court, Southern District of Mississippi
    • U.S. District Court, Northern District of Mississippi
    • Judicial Law Clerk for Hon. Taylor B. McNeel, U.S. District Court, Southern District of Mississippi
    • Judicial Law Clerk for Hon. Cory T. Wilson, U.S. Court of Appeals for the Fifth Circuit
    • Judicial Law Clerk for Hon. Michael K. Randolph, Mississippi Supreme Court

    Memberships and Affiliations

    Professional

      • Federalist Society
      • Federal Bar Association, Southern District of Mississippi - Executive Board Member
      • Harrison County Bar Association
      • Bar Association of the Fifth Federal Circuit

    Civic

      • Diocese of Biloxi St. Thomas More Guild
      • Knights of Columbus

    Professional

      • Federalist Society
      • Federal Bar Association, Southern District of Mississippi - Executive Board Member
      • Harrison County Bar Association
      • Bar Association of the Fifth Federal Circuit

    Civic

      • Diocese of Biloxi St. Thomas More Guild
      • Knights of Columbus
    • Overview
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    • Credentials
    • Memberships and Affiliations

    Related Services

    • Litigation
    • Appellate
    • Commercial Litigation
    • Construction/Design
    • Insurance
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