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About me

We are a unique boutique law firm concentrating in tax and fraud matters. Although small in size, we have handled some of the largest and highest profile cases in the U.S. and have offices in Milwaukee, Detroit, Minneapolis & Portland (ME). Presently we represent the whistleblower in the largest federal false claims act case in the U.S., the $2.4 billion case against Allied Home Mortgage.


In addition to being admitted to practice in Maine & Wisconsin, I am also admitted to practice before the U.S. Tax Court, U.S. Court of Military Appeals and many federal trial and appellate courts across the nation.


Most importantly, I enjoy what I do and look forward to coming to work everyday. Unfortunately few people can truly say that. 


Practice areas


  1. Consumer Protection: 40%
    33 years
  2. Tax: 30%
    33 years
  3. Tax Fraud: 30%
    33 years



Fixed (sometimes)

Payment types:


Attorney endorsements

1 total 

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  • Chris J. Trebatoski

    Brian is the most knowledgeable lawyer I have met on matters related to whistleblower litigation and tax fraud/evasion matters. He truly cares about his clients and is straightforward in his approach with clients, opposing counsel and the courts.


    Chris Trebatoski Litigation Attorney
    Relationship: Worked together on matter

Contact info

Mahany & Ertl LLC

1437 N. Prospect Ave
Suite 200
Milwaukee, WI, 53202


WIGood Standing200903/26/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Who's Who In Asset Recovery LawWho's Who Legal2012
Top 100 Trial LawyersNational Trial Lawyers Association2011
Governor's Team Work AwardState of Maine1997
Admitted - U.S. Tax CourtU.S. Tax Court1985
Work experience
TitleCompany nameDuration
Managing PartnerMahany & Ertl2009 - 2012
PartnerLaw Offices of Robert Bernhoft2007 - 2009
PartnerDoyle & Nelson2005 - 2006
Special CounselMaine Senate2003 - 2004
Assistant District AttorneyState of Maine1998 - 2002
State Revenue CommissionerState of Maine1995 - 1998
Assistant Attorney General - TaxState of Maine1991 - 1993
Associate AttorneyCassidy Despo & Foss1984 - 1985
Associate AttorneyWilentz Goldman & Spitzer1983 - 1984
Association namePosition nameDuration
Wisconsin Institute of CPA'sAd Hoc Publication Committee Member2011 - Present
International Association for Asset RecoveryBoard of Advisors2010 - Present
Family Violence ProjectBoard Member1999 - 2002
Legal cases
Case nameOutcome
United States v. Wesley SnipesAcquitted All Felonies
See all legal cases 
Publication nameTitleDate
Tennessee CPA JournalLien Release vs Lien Withdrawal2011
AZ CPALien Releases2011
SumnewsIRS Lien Releases2011
Florida CPA TodayUnreported Offshore Accounts2011
Wisconsin Institute of CPAsSection 165 Fraud Loss Deduction2011
Windy City TimesRevisiting the Case of Matthew Wayne Shepard2010
Wisconsin LawyerBusiness Model Covers Lawyers Absence2010
Journal of AccountancyThe IRS Whistleblower Program2009
School nameMajorDegreeGraduated
Tulane University Law SchoolN/AJD - Juris Doctor1983
University of DelawareBusiness AdministrationOther - Bachelors1980
Speaking engagements
Conference nameTitleDate
State Bar of Wisconsin, Solo and Small Firm ConferenceSuccession Planning For Lawyers2010
CLE eventResponding To IRS Criminal Investigations2009
CLE ProgramMaine Sales Tax2005