Tempe Office Providers

We currently have seven providers practicing out of our Tempe office. Please feel free to browse the bios of each of our providers below.

Joseph Piacentine, M.D., F.A.A.P.

I have been in practice since 1987 when I joined Mesa Pediatrics. I was born and raised in Colorado and attended college at the University of San Francisco, majoring in biochemistry and philosophy. I returned to Colorado for medical school at the University of Colorado. I moved to Phoenix to complete my pediatric residency at Phoenix Hospitals Affiliated Pediatric Program at Phoenix Children's Hospital and Maricopa Medical Center. I was Chief Resident in Pediatrics my last year. I am certified by the American Board of Pediatrics and have been re-certified twice. My wife is a pediatrician also. We have a college-age son, two dogs and a cat. Here are some of my favorite links; Keep Kids Healthy, LD Online, DrGreene.com, Denver Broncos, and Epicurious.com.

Delphis C. Richardson, M.D., F.A.A.P.

I'm a graduate of The Ohio State University College of Medicine and the Columbus Children's Hospital (now Nationwide Children's Hospital) residency program. I served four years of active duty in the United States Public Health Service, one year with National Health Service Corps at Baltimore, Maryland site, and three years with the Indian Health Service at Chinle, Arizona for the Navajo Area Indian Health Service. I completed a year as Chief Resident at Columbus Children's Hospital after which I was appointed to the OSU department of pediatrics faculty as Director of the Pediatric Residency Training Program. Currently, I volunteer as the long-time team physician to South Mountain High School in Phoenix, AZ. I'm married with three children and one grandchild. The Richardson family has four dogs and enjoys the daily farm chores of a small horse ranch.

Kristin McCleland, M.D., F.A.A.P.

My name is Kristin McCleland. I grew up in Wisconsin, and moved to North Carolina to attend Davidson College for my undergraduate degree in psychology. I taught and coached middle school before heading to medical school at East Carolina University. I completed pediatric residency training at Phoenix Children's Hospital/Maricopa Medical Center, and received board certification from the American Board of Pediatrics. I enjoy spending time with my husband, Jim and my kids, Flynn and James. I love basketball, hiking, reading, and cheering on the Green Bay Packers.

Darcey Winterland, M.D., F.A.A.P.

Hi! Welcome to Mesa Peds. After moving to Arizona as a small child from Illinois, I grew up in Mesa. My brother and I were even patients of Dr. Kerr's here at Mesa Peds. I attended the University of Arizona for college, where I studied Biology, Spanish and Wildcats Athletics. I stayed in Tucson for medical school then completed my residency at Phoenix Children's Hospital/ Maricopa Medical Center Pediatric Residency Program. I am board certified by the American Academy of Pediatrics. My hobbies include gardening, cooking, reading, and travel, especially any place with great food. I love spending time with my family, playing and watching sports and cheering for the Bears, Cubs and Wildcats. My favorite thing to do is anything with my amazing daughter, especially just be silly and giggle.

Michelle Valenzuela, M.D., F.A.A.P.

Hi! I’m Michelle Valenzuela. I grew up in Oracle, Arizona. I stayed close to home to pursue my dream of becoming a pediatrician. As a graduate of the University of Arizona College of Medicine I completed my pediatric residency training at Phoenix Children’s Hospital/Maricopa Medical Center. I have been in private practice since 2005 and am certified by the American Board of Pediatrics. My husband and I have lived in the East Valley for over 10 years. We are the proud parents of 2 beautiful children.

Jennifer Gibler, PA-C

Hi. I'm Jennifer Gibler and I've been practicing pediatrics since 1995. I received my B.S. degree as a Physician Associate from the University of Oklahoma College of Medicine. I also received a B.S. degree in fitness and wellness management from Southern Nazarene University. I'm certified by the National Commission of Physician Assistants. I love sports, traveling, and spending time with my family.

Buffy Patterson, PA-C

Hi. I'm Buffy Patterson, PA-C. I received my Masters of Medical Science Degree in Physician Assistant Studies from Midwestern University in 1998. I have worked in Pediatrics and Family Practice since then. I also have a Bachelors of Science in Psychology from Arizona State University (Go Devils!). I am married with 3 wonderful children, 2 sons and a daughter. For my "me time", I enjoy Bikram Yoga, training for and competing in triathlons, reading, and cheering my kids on at all of their events.

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