Michael Ronickher

Michael Ronickher is Of Counsel in the Washington, DC, office of Constantine Cannon LLP. He represents a broad range of whistleblowers, including in healthcare, defense, and financial frauds, with a particular specialty in representing tax whistleblowers.

Prior to joining Constantine Cannon, Mr. Ronickher was a Trial Attorney in the Tax Division of the Department of Justice. In his almost nine years at the Department, he served as lead counsel on numerous complex and high-profile litigations. Mr. Ronickher has deep experience with the most complicated types of litigation, including in cases involving complex tax avoidance or reduction schemes. Mr. Ronickher has extensive experience picking apart complex tax shelters. For example, he helped develop the government’s defense against so-called “previously taxed income” (PTI) tax shelters that were being used to shelter the income from $870 million. Earlier in his career, he served on the trial team of the Wells Fargo case involving $115 million in deductions based on a series of 26 tax shelters known as SILO (Sale-In, Lease-Out) transactions.

Mr. Ronickher worked closely with the IRS whistleblower office when he represented the United States in John Doe v. United States, which concerned a tax whistleblower’s tip that potentially pointed to over $500 million in tax fraud, which could have yielded a whistleblower award of $75 million. Mr. Ronickher also defended a challenge to the IRS’s Report of Foreign Bank and Financial Accounts (FBAR) Offshore Voluntary Disclosure Program, which was the main route by which U.S. citizens with foreign bank accounts could disclose them in return for reduced consequences.

Mr. Ronickher developed and successfully litigated numerous other cases featuring complicated laws, regulations, and financial transactions, including a complex foreign tax treaty case and defending against a novel challenge to a Treasury Regulation that was hindering a land-flipping business. Mr. Ronickher also spear-headed the Tax Division’s litigation concerning the Section 1603 grant program, which provided a federal subsidy for clean-energy investments. He independently handled the first such case to go to trial and, more recently, he led the Government’s trial team in a $260 million case regarding the valuation of portions of the largest wind farm in the United States, which had been sold through a complex series of transactions.

Mr. Ronickher is admitted to practice in California and the District of Columbia, as well as in the U.S. Tax Court, U.S. Court of Federal Claims, and the U.S. District Courts for the Northern District of California and the District of Colorado.

While at the Department of Justice, Mr. Ronickher was awarded the Tax Division Outstanding Attorney Award on three separate occasions. He was the recipient of two awards from the IRS: the Mitchell Rogovin Award and the IRS Lucite Award. He has also served as a conference speaker on tax law issues. Mr. Ronickher graduated with distinction from Stanford Law School. While at Stanford, he was a Public Interest Fellow and co-editor of the Journal of Civil Rights and Civil Liberties. Mr. Ronickher completed his undergraduate studies at Dartmouth College, where he graduated summa cum laude with a degree in Comparative Literature. Prior to law school, he worked as an editor for the life sciences textbook publisher Benjamin Cummings. Mr. Ronickher is proficient in German.

Michael Ronickher's Publications & Speeches

BankThink: AML enforcement needs more whistleblowers

Whistleblower attorneys Eric Havian and Michael Ronickher published in the American Banker (Jan. 7, 2019).

Read More
D.C. Council Testimony

Michael Ronickher delivered testimony supporting a bill in the D.C. Council that would permit tax cases under the District’s False Claims Act.

Read More
Why We Need Anti-Money Laundering Whistleblower Awards

Whistleblower attorneys Eric Havian and Michael Ronickher published in Law360 (Dec. 6, 2018).

Read More
Litigation Involving Tax-Exempt Organizations

Panelist; D.C. Bar Association Conference (2011).

Read More


Subscribe to receive email updates from the Constantine Cannon blogs

Sign up for: