Department profile
Complex Appellate Litigation Group LLP

Litigation: Appellate

USA Guide 2026 : California


Complex Appellate Litigation Group LLP

Rankings

About

Provided by Complex Appellate Litigation Group LLP

The Complex Appellate Litigation Group LLP (CALG) is a leading appellate specialty boutique, with more than two-dozen award-winning appellate attorneys, former Supreme Court and appellate clerks, and retired appellate jurists. The firm has no associates, and every lawyer has more than a decade of experience taking on high-stakes appellate matters for large corporations, small businesses, and individuals. The firm practices nationwide, with special expertise in California and the Ninth Circuit.

Recently, the firm:

  • prevailed on behalf of a Fortune 500 company in a $183 million Ninth Circuit appeal and defended that victory in the U.S. Supreme Court;
  • won a precedent-setting decision for a large national insurance company in the California Supreme Court concerning insurers' responsibility to cover COVID-related business closures, a ruling potentially worth billions;
  • obtained vacatur of a $36.5 million jury verdict against a mechanical engineering corporation sued in a wrongful death action;
  • and successfully defended on appeal an intellectual property judgment in favor of one of the world’s leading technology firms.

The firm is currently representing a European conglomerate in a contract and tort appeal with nearly $200 million at stake, a technology firm litigating a claim for founders' shares, a divorce appeal with nearly $1 billion in contention, and many more. The firm also often frequently embeds its appellate, writing, and litigation strategy experts on trial teams.

Chambers Review

Provided by Chambers

Litigation: Appellate - California

Band 2

Band 2


What the Team is Known For
Complex Appellate Litigation Group is a distinguished appellate boutique that acts for an impressive client base of major corporates, midmarket companies and individuals in complex appeals. The firm appears regularly before the California state courts and the Ninth Circuit.

Work Highlights

Provided by Chambers

  • Complex Appellate Litigation Group LLP represented Snap before the California Supreme Court concerning privacy protections for its users.

Strengths

Provided by Chambers

  • They have a lot of experience on appellate matters. They break issues down clearly, and are knowledgeable about what does and doesn't work.

    Litigation: Appellate respondentUSA
  • The firm has a deep bench of experience for appellate work in California, where each lawyer is seasoned and effective while also adding something to their team as a whole.

    Litigation: Appellate respondentUSA
  • They are client-focused and deliver excellent written work product.

    Litigation: Appellate respondentUSA

Notable Practitioners

Provided by Chambers

  • Band 2Mary-Christine (M.C.) Sungaila
    Band 2Mary-Christine (M.C.) Sungaila

    Mary-Christine (M.C.) Sungaila

    Mary-Christine Sungaila maintains a well-regarded and broad appellate practice, with recent experience in employment, trademark and immigration matters.
    • She is a superb appellate lawyer who matches tremendous ability with extensive experience.

      Litigation: Appellate respondentUSA
    • MC is an extremely thoughtful appellate practitioner who brings her wisdom and excellent experience to each matter.

      Litigation: Appellate respondentUSA
    • MC Sungaila is responsive, eager to work with and for our team, and produces highly sophisticated work product that we've always been pleased with.

      Litigation: Appellate respondentUSA
  • Band 2Rex S Heinke
    Band 2Rex S Heinke

    Rex S Heinke

    Rex Heinke is a highly regarded and well-respected veteran of state and federal appellate court disputes. He has impressive experience in acting for large international corporations across a range of sectors, as well as representing individuals.
    • He is calm under pressure, consistent in the advice he gives, and steady about the work and arguments that need to be done and made.

      Litigation: Appellate respondentUSA
    • Rex is a great, well-established appellate lawyer.

      Litigation: Appellate respondentUSA
    • He has a very conversational style from the podium. He makes it more like a conversation back and forth than a one-sided presentation. This is a style I try to replicate.

      Litigation: Appellate respondentUSA
  • Band 3Brian Sutherland
    Band 3Brian Sutherland

    Brian Sutherland

    Brian Sutherland is an experienced appellate litigator, with a strong track record in appearing before federal appellate courts on behalf of both individual and corporate clients.
    • Brian is a smart, responsive and efficient appellate lawyer.

      Litigation: Appellate respondentUSA
    • Brian Sutherland is brilliant at strategy, issue spotting, and narrative.

      Litigation: Appellate respondentUSA
  • Band 4Anna-Rose Mathieson
    Band 4Anna-Rose Mathieson

    Anna-Rose Mathieson

    Anna-Rose Mathieson is an experienced appellate litigator who has handled contract, employment and product liability-related cases, among others.

    • Anna-Rose is excellent and is the first call I make when I have an appellate issue.

      Litigation: Appellate respondentUSA
    • Anna-Rose Mathieson is exceedingly smart. She understands the big picture, delivers things on time, and recognizes client needs.

      Litigation: Appellate respondentUSA
  • Band 4Michael Von Loewenfeldt
    Band 4Michael Von Loewenfeldt

    Michael Von Loewenfeldt

    Michael Von Loewenfeldt has a robust appellate practice, which sees him act for corporates, government agencies and others at state and federal levels.

    • Michael is a very strong critical thinker who has great analytical insights.

      Litigation: Appellate respondentUSA
    • Michael is the equivalent of a supercomputer in terms of being able to absorb and apply complex ideas.

      Litigation: Appellate respondentUSA

Ranked Individuals at Complex Appellate Litigation Group LLP (5)

California

Members

Provided by Complex Appellate Litigation Group LLP

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