De la PeÑa
Law Office

(909) 483-0300​

8300 Utica Ave Suite 245

Rancho Cucamonga, CA 91730

De La Peña Law Office

Criminal Defenders

FederIco and Mary (M.J.) DE LA PEÑA, Esq.'s
The inland empire’s premier 
Criminal defense team

Our Promise to You:

“Our clients are our highest priority and it is critical that we always make them a part of our defense team. We promise to visit our incarcerated clients, provide them copies of all reports that are allowed to be shared by the law. Further, we believe that when a defendant hires an attorney, that client must do so with the trust that the attorney will actively include that client in their own defense.”

 M.J. (MARY) DE LA PEÑA, Esq.:

Mary (M.J. de la Peña) is a former prosecutor with the San Bernardino County District Attorney’s Office.  She continues to practice with her husband where the two of them act as dedicated team.  With more than 26 years of practice as a trial and appellate lawyer, Mrs. de la Pena is known for her writing skills and is an excellent trial lawyer. She has an outstanding "win" rate of more than 67%, and of the remaining cases more than half of those were overturned on appeal based on her pre-trial motions or post conviction alternative sentencing requests.

Mary de la Pena is also the author of AN IMMIGRANT AMERICAN HERO, and SCRUGGS and SAMANTHA, How a Shelter Dog and Kitten Saved Cinderella's Marriage, available through or the publisher's website at  Also available under her maiden name is MURDER MOST BLONDE and MURDER MOST JUDGMENTAL, the Detective Jake Swanson series by M. J. HATCH.

M.J. de la Peña received her bachelor of science in engineering from California State University at Long Beach and her Juris Doctor from the University of La Verne College of Law.  She is licensed to practice in all California State Courts, as well as several Federal Districts and the Ninth Circuit Court of Appeal.


With more than 43 years of experience, MR. FEDERICO A. DE LA PENA, is lthe most recognized name in Criminal Defense.  He is licensed to practice throughout the State of California and continues to serve the needs of his clients from the Inland Empire communities in San Bernardino and Riverside Counties, as well as Orange and Los Angeles Counties. He is also sworn to practice in the Federal Courts and is qualified to conduct military Courts Martial.  He travelsthroughout the United States and the world to represent his clients. 

As the most highly qualified criminal defense lawyer in the Inland Empire, Mr. de la Pena has represented eight clients charged with the Death Penalty, yet NONE of his clients are on Death Row.  More importantly, he believes in giving all of his clients the benefit of his knowledge whether they are charged with serious felonies such as murder with gang allegations; child molestation; felony spousal abuse and terrorist threats; or simple misdemeanors such as D.U.I.; vehicular manslaughter; petty theft; or violations of restraining orders. In all of these cases Mr. de la Pena and his staff of qualified attorney's continue to fight and win their cases with a "not guilty" or dismissal, or they negotiate with the prosecutor to have their clients receive either probation, diversion, or a much lighter sentence.

Federico de la Pena is a graduate of Occidental College with a Bachelor's degree in Economics and received his Juris Doctor from Southwestern College of Law. He is also a retired naval officer having served in the Naval Reserve as a pilot with ten years active duty and another 19 years in the Reserves. His professional experience also includes six years with the Los Angeles Public Defender's before leaving to go into private practice, where he has been for the last 34 years.

Years of Experience, dedicated to excellence