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About me

Born and raised in El Centro, California, Riisa Petersen has dedicated her career to protecting the rights of her fellow Arizonans. The Justice System can be difficult to navigate alone, and after nearly a decade practicing law Riisa has built a reputation based on experience, determination, grit and an unwavering dedication to YOU, her client.   


Riisa attended law school at Tucson's own James E. Rogers College of Law at the University of Arizona. After graduation, she was immediately hired as a prosecutor in the Pima County Attorney's office, where she specialized in DUI and domestic abuse prosections. It was there that Riisa learned the "prosecutor's playbook." 


In time, Riisa decided that her true desire was to defend the accused. She took her knowledge of the "prosecutor's playbook" and was immediately hired into a prominent Tucson firm in the private sector. For the last seven years, she has been working to defend the accused using her firsthand knowledge of prosecutorial tactics. Riisa knows what moves the prosecutor will make against you, making her better able to defend you against them. In addition to criminal defense, Riisa successfully built and managed the Family Law and Domestic Relations wing of the firm in which she became second in command. It would continue to thrive throughout her tenure.


Today, Riisa operates her own practice based on the respect, experience and reputation that she has earned in Tucson's legal community. Her philosophy is simple: YOU are her priority. Your defense is her duty and your right. When you retain the Petersen Law Firm, you won't end up with a nameless first year attorney. You get Riisa, every time. 


Don't gamble your future on an "associate" attorney. Experience matters. As a successful trial attorney and litigator with firsthand knowledge on both sides of the criminal system and unparalleled leadership experience in family law, nobody is better prepared to defend your rights and fight for you and your family.


Photos and videos

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Practice areas


  1. Divorce: 15%
  2. Family: 13%
  3. Domestic Violence: 12%
  4. Prenuptials: 12%
  5. Other: 48%
  6. More 



Hourly ($200-275/hour)

Payment types:

Cash, Check, Credit card

Attorney endorsements

11 total 

Are you an attorney? Endorse this lawyer

  • No photo

    I have been practicing law since June of 2008 and was an Assistant City Prosecutor until June of this year. During this time I had numerous court appearances with Ms. Petersen as opposing counsel including several evidentiary hearings and at least one jury trial. Ms. Petersen has integrity, is respectful not only to other attorneys and the bench, but also to her clients. In my experiences, she is consistently a competent and zealous advocate for her clients. I have no hesitation in saying that I believe Ms. Petersen would be an excellent choice to assist with not only criminal matters but also with any family law issue that may need resolved.


    Sara Dent
    Relationship: Opposing Counsel on matter

  • Carl Raymond Sammartino

    I went to law school with Riisa, and I know she is a great representative for DUI defendants and also in family law matters.


    Carl Sammartino Land use and zoning Attorney
    Relationship: Fellow lawyer in community

Contact info

Petersen Law Firm PLLC

485 S. Main Ave., Bldg 3
Tucson, AZ, 85701


AZActive 200612/12/2014

Professional misconduct

This lawyer was disciplined by a state licensing authority.

  1. Probation
    issued in AZ, 2011


    Probation means an attorney did something wrong but may still practice law. The State monitors the lawyer's activities for a period of time in hopes that he or she will not repeat the behavior.

Avvo contributions
Legal answers
Award nameGrantorDate granted
Client's Choice AwardAVVO2016
Work experience
TitleCompany nameDuration
Managing AttorneyPetersen Law Firm PLLC2013 - Present
AttorneyLaw Firm2007 - 2013
Association namePosition nameDuration
National College of DUI DefenseMemberN/A
Legal cases
Case nameOutcome
Sullivan v. SullivanWin
See all legal cases 
School nameMajorDegreeGraduated
University of Arizona College of LawLawJD - Juris Doctor2006
University of California - Santa BarbaraEnglishBA - Bachelor of Arts2003