Michael Ronickher

Michael Ronickher is a partner in the Washington, DC, office of Constantine Cannon LLP. He represents a broad range of whistleblowers, including in healthcare, defense, securities, and financial frauds. He also leverages his background in tax enforcement at the Department of Justice to represent tax whistleblowers. For his work, Mr. Ronickher has been recognized by Best Lawyers and in 2019 as a Law360 Rising Star.

Mr. Ronickher currently represents numerous whistleblowers in litigation and sealed investigations under federal and state False Claims Acts, where he helps clients navigate the sometimes-confusing process and helps the government investigate the alleged frauds. These cases range from government contracting violations stemming from substandard materials or cybersecurity failings to various healthcare billing frauds involving everything from unbundling fraud to Medicare Part C and the Anti-Kickback Statute.

Notably, Mr. Ronickher is lead counsel for relator Dr. James Taylor in his False Claims Act lawsuit alleging healthcare billing fraud by Kaiser Permanente. The government has intervened in a portion of his claims, alleging hundreds of millions in fraudulent claims, and Constantine Cannon attorneys are pursuing other claims on a non-intervened basis.

Mr. Ronickher is also the lead attorney representing whistleblower Teresa Ross in the litigation of her healthcare fraud False Claims Act case against multiple defendants. The case partially settled against Group Health Cooperative in 2020, and the government has intervened in the remaining case against several other defendants.

In 2019, Mr. Ronickher’s client James Glenn became the first-ever successful cybersecurity whistleblower when he settled his case alleging that Cisco Systems had knowingly sold video surveillance equipment with serious security flaws to various federal, state, and local government agencies.

Mr. Ronickher also draws on a near-decade of experience of litigation of tax and financial stimulus frauds at the Department of Justice to represent numerous whistleblowers bringing the SEC evidence of securities fraud or Foreign Corrupt Practices Act violations. He also advocated for the creation of FinCEN’s anti-money laundering (AML) whistleblower program and represents clients who have submitted tips regarding compliance failures that have led to hundreds of millions of dollars in illegally laundered funds.

He also is a leader in the firm’s representation of whistleblowers who have used the IRS’s whistleblower program to expose tax fraud or avoidance. These whistleblowers have brought forward information about a wide range of schemes that add up to billions of dollars in tax avoidance. Professor Diane Ring, who brings a deep knowledge of tax law, and Bob Gardner, who brings first-hand experience at the IRS Whistleblower Office, are key collaborators in this process. Mr. Ronickher also currently represents clients in several U.S. Tax Court cases challenging IRS whistleblower award determinations.

Mr. Ronickher is active in pro bono whistleblower work, as well. He represented Senator Charles Grassley of Iowa in the drafting and filing of an amicus brief to the Supreme Court regarding the Seventh Circuit decision in SuperValu. He also represents a prominent government whistleblower, Simon Edelman, before the U.S. Office of Special Counsel. Along with Whistleblower Aid, Mr. Ronickher brought allegations that Mr. Edelman was fired from the Department of Energy after providing photos to the press that contradicted the Secretary of Energy’s story about a meeting with a coal industry lobbyist, as reported in the New Yorker.

Drawing on his false claims and tax experience, Mr. Ronickher is a frequent author and conference speaker on whistleblower issues. He is also a member of the Diversity, Equity, and Inclusion Committee at the firm, as well as the DEI Committee of Taxpayers Against Fraud.

Prior to joining Constantine Cannon, Mr. Ronickher served as lead counsel on numerous high-profile litigations at DOJ. As a result, Mr. Ronickher has deep experience with every phase of complex litigation, including in cases involving complex tax avoidance or reduction schemes. 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, and he served on a trial team that successfully challenged $115 million in deductions from SILO (Sale-In, Lease-Out) tax shelter transactions.

At DOJ, Mr. Ronickher worked closely with the IRS Whistleblower Office to defend it in a case involving a tax whistleblower’s tip that potentially pointed to over $500 million in tax fraud. Mr. Ronickher also defended a challenge to the IRS’s Report of Foreign Bank and Financial Accounts (FBAR) Offshore Voluntary Disclosure Program.

Mr. Ronickher additionally 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 later led the Government’s trial team in a $260 million case regarding the valuation of the sale-leaseback of a $1.65 billion wind farm.

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.

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 District of Columbia, the Northern District of California, and the District of Colorado.

Mr. Ronickher graduated with distinction from Stanford Law School, where he was a Public Interest Fellow and co-editor of the Journal of Civil Rights and Civil Liberties. He completed his undergraduate studies at Dartmouth College, graduating 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

The IRS is stuck in a political logjam–but whistleblowers can stop its decline

Whistleblower attorneys Michael Ronickher and Chris McLamb were published in Fortune, The IRS is stuck in a political logjam–but whistleblowers can stop its decline (June...

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COVID Relief Fraud – Opportunities to Recover Hundreds of Billions of Dollars

Whistleblower partner Mike Ronickher co-presented on fraud against the Government in COVID relief programs at the OffshoreAlert Conference 2023. (May 3, 2023)

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Whistleblower partner Mike Ronickher spoke on a Taxpayers Against Fraud panel as one of the authors of the amicus brief for Senator Grassley about the...

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Focus on Medicare Part C

Whistleblower partner Mike Ronickher moderated the panel “Focus on Medicare Part C” in the 2022 ABA Civil False Claims Act and Qui Tam Enforcement Virtual Institute....

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A recent case could undermine the rules that have been protecting taxpayer money from fraud since the time of Lincoln

Whistleblower attorneys Eric Havian, Mike Ronickher, and Ari Yampolsky were published in Fortune, A recent case could undermine the rules that have been protecting taxpayer...

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Risky Business: The Dangers of Intelligence-Gathering

Whistleblower partner Mike Ronickher moderated a panel entitled "Risky Business: The Dangers of Intelligence-Gathering" at OffshoreAlert Miami, a conference on intelligence, investigations, and recovery (April...

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Commentary: Hochul to tax cheats: Just do it quietly and don’t get caught.

Whistleblower attorneys Ginger Buck and Mike Ronickher were published in the Times Union, Commentary: Hochul to tax cheats: Just do it quietly and don’t get...

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What Maryland Can Learn From the IRS On the State’s New Tax Program

Michael Ronickher and Ari Yampolsky were published in The Washington Post, What Maryland can learn from the IRS on the state’s new tax program (July...

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SEC Examines Relationship Between Bad Books and Bribery Schemes

Whistleblower attorneys Mike Ronickher and Sarah “Poppy” Alexander published in the New York Law Journal, SEC Examines Relationship Between Bad Books and Bribery Schemes. Click...

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SEC Examines Relationship Between Bad Books and Bribery Schemes

Michael Ronickher and Sarah Poppy Alexander were published in the New York Law Journal.  The article discusses a heartening trend in the SEC's enforcement of...

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Constantine Cannon Attorneys Provide Comments on Model Whistleblower Award and Protection Act

The North American Securities Administrators Association (NASAA) has proposed a Model Whistleblower Award and Protection Act that would serve as a guide for states across...

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The Changes Helping IRS Whistleblower Program Grow Up

Law 360 (subscription required), September 4, 2019.

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The Need for Whistleblowers in AML Enforcement

Banking Exchange publishes article by Eric Havian and Michael Ronickher.  Click here to read the article.

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BankThink: AML enforcement needs more whistleblowers

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

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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.

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Why We Need Anti-Money Laundering Whistleblower Awards

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

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Litigation Involving Tax-Exempt Organizations

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

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