
Litigation: Appellate
USA Guide 2026 : California
Rankings

Ranked Individuals
Ranked Individuals
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
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 respondentUSAThe 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 respondentUSAThey are client-focused and deliver excellent written work product.
Litigation: Appellate respondentUSA
Notable Practitioners
Provided by Chambers
Band 2 
Band 2 
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 respondentUSAMC is an extremely thoughtful appellate practitioner who brings her wisdom and excellent experience to each matter.
Litigation: Appellate respondentUSAMC 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 2 
Band 2 
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 respondentUSARex is a great, well-established appellate lawyer.
Litigation: Appellate respondentUSAHe 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 3 
Band 3 
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 respondentUSABrian Sutherland is brilliant at strategy, issue spotting, and narrative.
Litigation: Appellate respondentUSA
Band 4 
Band 4 
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 respondentUSAAnna-Rose Mathieson is exceedingly smart. She understands the big picture, delivers things on time, and recognizes client needs.
Litigation: Appellate respondentUSA
Band 4 
Band 4 
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 respondentUSAMichael 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)
Members
Provided by Complex Appellate Litigation Group LLP

Anna-Rose Mathieson

Ben Feuer
Head of Department

Kirstin Ault

Sharon Baumgold

Melanie Gold

Katy Graham

Susan Horst

Charles Kagay

Jens Koepke

Frank McGuire

Claudia Ribet

Robert A. Roth

Johanna Schiavoni

Jocelyn Sperling

Jennifer Teaford

Jessica Weisel

Greg Wolf

Kelly Woodruff

Susan Yorke

Pat Benke

Greg Ellis

Michael von Loewenfeldt

Anna-Rose Mathieson
View profile of Anna-Rose Mathieson
Brian Sutherland
View profile of Brian Sutherland
Rex S Heinke
View profile of Rex S Heinke
Mary-Christine (M.C.) Sungaila
View profile of Mary-Christine (M.C.) Sungaila
Michael Von Loewenfeldt
View profile of Michael Von Loewenfeldt
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