San Tan Providers

We currently have five providers practicing out of our San Tan office. Please feel free to browse the bios of each of our providers below.

Aleta DaSilva, M.D., F.A.A.P.

Hello. My name is Aleta DaSilva and I am originally from Santa Fe, New Mexico. I received my Bachelor of Science degree in Biology as well as my medical degree from the University of New Mexico in Albuquerque. I completed residency at Phoenix Children's Hospital/Maricopa Medical Center integrated program in 2005 and am board certified by the American Board of Pediatrics. I am married to a pharmacist and we have three boys. We enjoy spending our free time hiking, camping, traveling and attending soccer games. I look forward to working with you and your family in the future.

Andrea DeMets, M.D., F.A.A.P.

Hi! My name is Andrea DeMets and I'm very excited to be a part of Mesa Pediatrics. I am originally from Wisconsin and continue to be a huge Badger fan! I completed medical school at the University of Wisconsin - Madison and finished my pediatric residency there as well. I had a short hiatus in Providence, RI where I did my pediatric internship at Brown University. I am certified by the American Board of Pediatrics and have been practicing pediatrics since 2005. When I am not working, I enjoy reading, traveling and spending time with my family, which includes my husband and our three very active sons.  I look forward to meeting you and your family sometime soon!


Reyna Cuellar, M.D., F.A.A.P. 

Hi! My name is Reyna Cuellar and I am very happy to be a part of Mesa Pediatrics. I grew up in the East Valley and graduated from Chandler High School before I went on to study Human Biology at Stanford University. I attended medical school at the University of Arizona and continued my training at the Phoenix Children's Hospital / Maricopa Medical Center Integrated Program. Shortly after completing residency, I was certified by the American Board of Pediatrics. I love spending most of my free time with my family. My husband, Eliud, and I have been blessed with three wonderful children - Eli, Isabella, and Noe. We stay busy with church activities, soccer games, and traveling.  I look forward to working with your family in the near future!


Hoai-Trinh Nguyen, M.D., F.A.A.P.

Hello!  I was born and raised in Denver, Colorado.  I attended the University of Denver for my undergraduate studies and attended medical school at the University of Colorado.  I completed my residency training at Phoenix Children's Hospital and Maricopa Medical Center.  Prior to joining Mesa Pediatrics, I worked as a hospitalist for the Bone Marrow Transplant team at Children's Hospital Los Angeles. I have been a part of the Mesa pediatrics family since 2014.  In my spare time, I enjoy spending time with family and friends, reading, hiking, and traveling.


Stefanie Laystrom, PA-C

Hi, my name is Stefanie Laystrom. I grew up in the Chicago suburbs andwill forever be a Cubs and Bears fan, but I love the mountains and sunshine of Arizona!  I received my bachelor's degree in Sports Medicine from Central Michigan University in 2002. I worked as a Certified Athletic Trainer at Central High in Phoenix for two and a half years before going to graduate school at Midwestern University in Downers Grove, IL. I graduated in 2007 with a Master of Medical Science in Physician Assistant Studies. When the opportunity presented to come back to AZ and work at Mesa Peds, I jumped at the chance! My husband is a registered nurse. We have three great kids, two girls and one boy, and one silly dog.