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Pediatrician Staff

All professionals at Gilbert Pediatrics maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in the medical field. Read on to learn more about our staff's experience and training.

Lafe Carroll, DO FAAP

Dr. Lafe Carroll is a native Arizonan, growing up in Mesa. He graduated from Mesa High and went on to MCC briefly before going to Colombia for two years on a mission for the Church of Jesus Christ of Latter Day Saints. It is here he became fluent in Spanish and continues to use it in his practice. He then graduated from Brigham Young University with a degree in Family Sciences. He attended Medical School at Kirksville College of Osteopathic Medicine in Kirksville, Missouri. After Graduating in 2002, he completed a pediatric Residency at St. Joseph's Hospital in Phoenix, Arizona, where he was awarded "Resident of the Year" for his graduating class. He has been practicing with Gilbert Pediatrics since 2005. He is board Certified in Pediatrics and a Fellow of the American Academy of Pediatrics. In 2010, Dr, Carroll was chosen as one of Arizona's "Top Docs" for Pediatrics in the "Phoenix Magazine".

Dr. Carroll is Married to his high school sweetheart and they have 6 children. He is actively involved in his church and the scouting program. He enjoys reading and spending time with his family.

Tim Jacks, DO FAAP

Originally from Elmhurst, Illinois, Dr. Jacks has lived in the greater Phoenix area since 1988. He was a home school graduate before moving on to Arizona State University and finally medical school at Midwestern University in Glendale, AZ. Dr. Jacks completed his pediatrics residency at St. Joseph's Hospital in Phoenix in 2011.

Dr. Jacks is board certified by the American Board of Pediatrics and a fellow of the American Academy of Pediatrics. As a passionate vaccine advocate, Dr Jacks works with local and national advocacy groups, has testified before the United States Senate HELP Committee, and enjoys educating families about the importance of immunizing against vaccine preventable diseases.

When not working, Dr. Jacks enjoys spending time with his family, running, playing with computers, exploring the great outdoors, and being involved at Rock Point Church

Gary Auxier, MD FAAP

*Currently serving a church mission until 2025 in Alanta, GA*

Dr. Auxier is a board certified pediatrician since 1981, and Fellow of the American Academy of Pediatrics since 1984. He went to medical school in Tuscon and Pediatric training in Phoenix. In 1981, he was the Chief Resident in Pediatrics at the County Hospital in Phoenix. In private Practice for 30 years, he also volunteers at the Chandler Care Center free clinic, and has been awarded the Coy Payne Lifetime Achievement award from United Way for his volunteer work in Arizona, Mexico

Xin Tan, MD FAAP

Dr. Tan was born and raised in southern China. She received her MD from Hebei Medical University in 2004 and pursued with PhD in Surgery/Oncology at the 1st affiliated Hospital of Sun Yat-sen University. In 2007 She came to US as a visiting PhD student at Emory University for her research on breast and ovarian cancer. She met her husband Liping in Atlanta and they married in 2009 before her PhD defense. In 2012 she relocated to Arizona with her husband, who teaches Mechanical Engineering in ASU. She completed USMLE while she actively volunteered in Maricopa Medical Center before she matched to The Brooklyn Hospital Center for pediatric residency training in 2016. She was trained to be a surgeon but now she found her true love in Pediatrics.

Dr. Tan has 2 children, Shirley and Jeremy. In her free time She enjoys playing basketball, hiking with family and road trips to National Parks.


Brett Holdaway, DO

Dr. Brett Holdaway grew up in a family of 13 kids in Payson, UT. After high school, he spent two years serving a mission for The Church of Jesus Christ of Latter-day Saints in Taiwan. After finishing his mission, Dr. Holdaway attended Brigham Young University and graduated with a bachelor’s degree in Chinese while he prepared for medical school. He obtained a master’s degree in Biomedical Sciences and his Doctor of Osteopathy at Kirksville College of Osteopathic Medicine in Kirksville, Missouri. Dr. Holdaway completed his pediatric residency training in Syracuse, New York. During that time he received multiple teaching awards and at graduation received the coveted “Compassionate Care” award. Dr. Holdaway loves listening to his patients and strives to give them the best care possible.

 Dr. Holdaway and his wife Becky have two kids that keep them busy. In his spare time, Dr. Holdaway enjoys spending time with his family, going on hikes, running, and weekly dates with his wife. In the fall, you will always find him watching BYU football, Go Cougars

Brad Brad Guthrie, MD FAAP

Dr. Guthrie grew up in Mesa, AZ. If you are wondering because of the last name, he and the former Dr. Dale Guthrie are first cousins once removed. Like many of you, Dr. Dale Guthrie was his doctor growing up. After graduating from Mesa High School, he obtained his Bachelor of Science degree in Biochemistry from Arizona State University. Unsure of whether he wanted to become a professor or a physician, he started working for both Mesa Public Schools in the AVID program and for Banner Gateway Emergency Department as a medical scribe. As is evident, medicine was the final choice.

He obtained his Medical Degree from University of Arizona School of Medicine in Tucson, AZ and completed Pediatric Residency in Memphis, TN at LeBonheur Children’s Hospital and University of Tennessee. If it was not for extended family in Arizona, he and his family would still be in Tennessee and probably at LeBonheur. They fell in love with the trees and the rivers and most especially the people there. If you catch him on a good day or get him talking about Tennessee, you may hear a good “y’all” or start to hear his drawl come out. 

Despite that, he, his wife, and his 4 kids are excited to be back in Arizona, close to family and friends, and excited to be part of this practice. In his spare time... wait he has young kids, he has no spare time... You may find him at the public library with his boys, or at the grocery store, or cleaning up another disaster in the kids' bathroom, or making dinner. He is waiting for spare time to return. Stay tuned...

Melani Jaskowiak, RN CPNP-PC

Melani Jaskowiak grew up in Minnesota. She attended Montana State University from 1977-1982 and Graduated with a Bachelor of Science Degree in Nursing.

In 1982 Melani relocated to Phoenix, Arizona and started employment with Good Samaritan Medical Center on a general medicine/gastrointestinal care ward. In 1983 Melani transferred to the pediatric intensive care unit (PICU) and was employed there for 6 years. Following an educational course in surgical nursing, Melani was hired as the Neuroscience Nurse Clinician for Phoenix Children's Hospital where she was employed for 9 years. Melani graduated from ASU in 1997 with a Master of Science degree.

Melani is a Certified Pediatric Nurse Practitioner and a member of the National Association of Pediatric Nurse Practitioners, national and local chapters. She is also a member of Sigma Theta Tau, the nursing honor society.

Melani has two adult children. She is an active member of the Sweat Hawgs, a mission team that travels to the Dominican Republic once a year. Melani enjoys playing soccer, golf and hiking as well as traveling and spending time with friends.

Deborah Howard, RN MS PNP

Deborah was born and raised in Arizona. She received her Bachelors of Science in Nursing from Northern Arizona University in 1988. She trained at St. Joseph's Hospital and Medical Center/Children's Health center and attended ASU for a Master Degree and Pediatric Nurse practitioner Certification. She is a member of the National Association of Pediatric Nurse Associates and Practitioners. Also a proud mother of 2 sons and an avid dog lover. Enjoys outdoor activities and sports.


Brittany Kunz, DNP CPNP-PC

Brittany Kunz was born and raised in Mesa, Arizona. She's always had a passion for learning and probably won't stop educating herself until she dies. Even though she is a crossfit, marathon-running junkie,you can catch her with a batch of homemade chocolate chip cookies snuggled under a blankie watching Josh Lucas movies on the weekend. Because who does't need Josh Lucas in their lives? Brittany doesn't back down from a challenge. Ever. She's a highly competitive woman and anybody who has ever played Wackee Six with her can attest to this. She loves Jesus but she cusses a little. She might also have a twisted sense of adventure. Maybe.

In her spare time raising 5 kids, one with special needs who has her chasing her tail all day, she attended ASU, got her Doctorate in Nursing, and is a Certified Nurse Practioner. She is passionate about healthcare and gives 100% to her patients and their families.


Lynn Bevans, DNP CPNP-PC

Lynn Bevans is excited to belong to Gilbert Pediatrics! She is originally from Alberta, Canada, where she received her RN license in 1989. She has lived in Gilbert, Arizona since 1997, and she has worked as a nurse in several areas including NICU, school nursing, utilization review, and case management. She has earned her BSN and MSN from Chamberlain College of Nursing before finding her true path. She graduated from Arizona State University with her DNP becoming a Pediatric Nurse Practitioner in 2021. She belongs to the National Association of Pediatric Nurse Practitioners as well as the Sigma Theta Tau International Honor Society of Nursing. She is also a volunteer for the Maricopa County Health Department.

Lynn is married and has two adult children. Her passions include exercise, baking, reading, and traveling.