Siderius Lonergan & Martin LLP
Serving the Northwest since 1959
Siderius Lonergan & Martin, LLP is dedicated to providing high-quality and personalized legal services. Our lawyers and support staff are committed to vigorous, ethical and economical representation tailored to meet the needs of our clients.
Practice areas include general and complex litigation, business and commercial law, banking and credit union law, criminal defense, real estate, and estate planning.
Michael G. Martin
MichaelM@sidlon.com
Michael Martin joined Siderius Lonergan & Martin in 1995. He has more than 27 years experience in federal criminal defense matters. His practice focuses on representing corporate employees and individuals in federal investigations, including grand jury investigations and investigations by federal administrative agencies such as the Securities and Exchange Commission, the Environmental Protection Agency and the National Transportation Safety Board. Michael also advises businesses on how to prevent and/or manage being the subject of a federal investigation.
From 1981 to 1995, Michael was an Assistant Federal Public Defender in Seattle, handling more than 1,500 federal criminal matters for indigent clients. Michael was lead counsel in United States v. Bagley, 473 U.S. 667 (1985). In that case, the United States Supreme Court, ruling for the defense, held that whether or not the defense makes a specific request for information that tended to exculpate the defendant, the due process clause of the United States Constitution required that material exculpatory evidence be disclosed to the defense.
Michael has lectured on Federal Grand Jury Practice and on Jury Selection in Federal Courts. He served as a volunteer lawyer with the Innocence Project Northwest, in which his client, a defendant in the infamous “Wenatchee Sex Ring” cases, spent six years in custody before his conviction was vacated and he was released from prison.
Michael has been named as one of Washington State’s Superlawyers since 2000 and was named one of The Best Lawyers in America in 2007, an honor he has received since 2003.
Areas of Practice
- Federal criminal defense.
Bar Admissions
- State of Washington.
- U.S. District Court, Western District of Washington.
- U.S. District Court, Eastern District of Washington.
- U.S. Court of Appeals, Ninth Circuit.
Other Professional Associations
- American Bar Association.
- Washington State Bar Association.
- National Association of Criminal Defense Lawyers
- Washington State Association of Criminal Defense Lawyers.
- Washington State Society of Healthcare Attorneys.
Notable cases
- Lead counsel, United States v. Bagley, 473 U.S. 667 (1985).
- Volunteer lawyer with the Innocence Project Northwest.
Education
- J.D., Seattle University School of Law, 1980.
- B.A., University of Washington, 1975.
Community Involvement
- Volunteer lawyer, Innocence Project Northwest.
Please Call: 206-624-2800

Please Call: 206-624-2800
Our attorneys
Our lawyers and support staff are experienced advocates devoted
to providing successful outcomes for individuals and businesses.
By maintaining a small, collegial atmosphere, our attorneys can focus preparation on each case while drawing on the broader knowledge
of the firm.
Our attorneys
Our lawyers and support staff are experienced advocates devoted
to providing successful outcomes for individuals and businesses.
By maintaining a small, collegial atmosphere, our attorneys can focus preparation on each case while drawing on the broader knowledge
of the firm.
ATTORNEY
PROFILES
PARTNERS
ASSOCIATES
OF COUNSEL
About our firm
Siderius Lonergan & Martin, LLP was founded in 1959 by Ray Siderius, Charles Lonergan Jr. and the late Washington State Court of Appeals Judge T. Patrick Corbett. Today the firm continues to enjoy a small collegial atmosphere. We have been given the highest AV rating for skill and integrity by Martindale Hubbell. Our practice areas include general and complex litigation, business and commercial law, banking and credit union law, criminal defense, real estate, and estate planning.
Our experienced attorneys handle matters ranging from small business issues to major class action litigation. In Hemphill v. Department of Revenue, we prevailed in a class action challenge to the Department of Revenue’s collection of estate taxes that resulted in the highest tax refund in Washington state history (over $150 million).
Our attorneys and staff have fulfilling lives both inside and outside time spent in the office or courtroom. Whether coaching youth and Special Olympic sports, tutoring underprivileged children, providing volunteer legal services or serving on boards of non-profit organizations, members of the firm are committed to giving back to the community.
Our offices are in the Logan Building in downtown Seattle.
Map of our location. Directions to our offices.
Areas of PracticeOur areas of practice
The lawyers at Siderius Lonergan & Martin, LLP represent individuals, insurance companies, financial institutions, credit unions, construction suppliers, and real estate developers. In addition to helping businesses and individuals protect assets, the firm has successfully represented members in class action lawsuits and assisted numerous individuals in recovering damages.
Banking/
Credit Union Law
Civil Litigation/
Complex Civil Litigation
Class Actions
Criminal Defense
Estate Planning/
Probate
General Business Representation
Real Estate