USA Guide 2026 : USA - Nationwide
Ranked Individuals
Provided by Chambers
Arnold & Porter has a wealth of experience advising on a wide array of complex regulatory matters, as well as representing clients in investigations by the SEC, PCAOB and other agencies. The firm acts for auditors, accountants and other professional services providers. It has additional capabilities in litigation.
Provided by Chambers
Arnold & Porter represented RSM US, which provided tax return preparation services over a decade ago to Yorkville Global and certain affiliates and funds that had onshore and offshore entities. Yorkville sued RSM, as well as certain former partners of the firm, for malpractice.
Provided by Chambers
Arnold & Porter has great attention to detail and a team that can dig into the weeds of the case in terms of the documents and facts.
They have tremendous commercial awareness and are very experienced in the industry.
They are dogged investigators. They cross every T and pull every thread.
Arnold & Porter does a very good job of thinking five steps ahead. They're responsive, responsible and are strategic thinkers.
Provided by Chambers
Veronica Callahan excels in advising and representing auditors, accounting firms and consultants in a wide array of litigation and regulatory matters, including SEC and PCAOB investigations. She chairs Arnold & Porter's securities enforcement and litigation practice.
Veronica Callahan is a practical and no-nonsense lawyer, with good litigation instincts. She's the best of New York litigation. She isn't brash or showy, just exceptional.
Veronica Callahan does a great job handling big calls. She's sensitive and handles difficult parties very well. She's number one.
Veronica has great strategic perspective and brings a lot of experience to bear on regulatory matters.
Veronica Callahan is just a leader in the industry.
Veronica is an overall strategist who is very technically competent.
Kathleen Reilly is recognized for her expertise advising auditors and accounting firms on a wide array of regulatory matters, including investigations by the SEC, PCAOB and others. She also has a broad base of litigation experience.
Kathleen is the most technically competent and detailed. She understands our systems very well, and she produces very good written work.
Kathleen is extraordinarily bright, she has great judgement and also a great manner with witnesses.
Kathleen is a strategic thinker who is measured and thinks three steps ahead. She's also careful and meticulous, thinking things through and making good suggestions.
Kathleen has an incredible command of the facts and the IRS regulations. she is also really good on strategy and knowing which arguments to pursue.
Accountant and Auditor Liability
Accountant and Auditor Liability
Chambers is the leading data and intelligence partner for the legal sector.
