About Us

Your dedicated advocate


Experience you can trust

What we offer our clients


1. We spend sufficient personal time with our client in order to prepare mitigation.

2. We conduct a thorough investigation into the bio/psychological history of our client to identify potential mitigating factors that should be presented as well as creating the personal story of our client.

3. We  interview witnesses such as family members, peers, co-workers, teachers,  clergy, counselors, etc. that have important pieces to the puzzle of our client's life experiences and can provide important supporting mitigating evidence.

4. We identify the need for experts in areas such as psychology, neuro-biology, neuro-psychology, risk assessments and mental health evaluations and provide resources for substance abuse and social service programs.

5. We highlight the implications of abuse, neglect, disability, trauma, substance abuse, and mental health issues to support arguments and assist in finding appropriate experts to support mitigating factors.

6. We prepare a well documented and supportive mitigation report that strategically addresses the key mitigating factors for judges and juries to consider.

7. When appropriate, we include photos and video clips with our mitigation report.

Who we are


Sheri Castillo is the owner and founder of On Your Side Mitigation.

 Ms. Castillo began her criminal justice career in 1995 when she began working as a Surveillance Officer with Maricopa County Adult Probation. She later went on to work as a Youth Corrections Officer for the Arizona Juvenile Corrections Department and as an Inmate Classification Counselor for the Maricopa County Sheriff's Office. 

After nearly 10 years of working on the side of law enforcement, Ms. Castillo went to work as a paralegal in criminal defense law where she remained for 14 years before starting On Your Side Mitigation. 

   Ms. Castillo has a B.S. degree from A.S.U. in criminal justice, and two master’s degrees from Grand Canyon University in both criminal justice and addiction counseling. 

    Ms. Castillo has been successfully providing in-depth, quality mitigation reports since 2016.

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Contact Us

On Your Side Mitigation

389 East Palm Lane, Phoenix, Arizona 85004, United States

(602) 214-6650 mitigationgirl602@gmail.com


Hours are by appointment and can be flexible to accommodate the needs of our clients and their families.