Our Providers and Staff

Our Providers

S Reed Shimamoto


Dr S. Reed Shimamoto grew up in Montana and Colorado. He obtained his medical degree from the University of Colorado Health Sciences Center, in Denver, CO. He completed his Pediatric Residency at St. Joseph’s Hospital and Medical Center in Phoenix, AZ from 1997 to 2000 and served as Chief Resident 2000-2001. he then completed his Allergy & Immunology fellowship at National Jewish Health Center and University of Colorado School of Medicine in Denver from 2001 to 2003, Colorado where he was Chief Fellow and a member of the Medical Staff between 2002-2003. Dr. Shimamoto founded San Tan Allergy & Asthma in 2005, and has been featured in Phoenix Magazine’s “Top Docs” issues. He is currently a member of the American College of Allergy and Immunology, the American Academy of Allergy, Asthma and Immunology, The American Academy of Pediatrics and is Board Certified in Allergy & Immunology and Pediatrics. Dr. Shimamoto has lectured on asthma, allergies, anaphylaxis, food allergy and eosinophilic diseases at local and national programs. He is currently accepting new pediatric and adult patients. Dr. Shimamoto lives in Gilbert with his wife and daughters and enjoys responsible marine fish/reef keeping, gardening, swimming and cooking.

top doctor 2020
top doctor 2021
top doctor 2022

Jennifer Hill


Dr. Jennifer Hill grew up in Mesa, Arizona. She graduated Magna Cum Laude from Arizona State University where she received a Bachelors of Science in Psychology. She then attended medical school at the University of Arizona College of Medicine in Tucson. While at the University of Arizona, Dr. Hill was inducted into the Alpha Omega Alpha Honor Medical Society and graduated with honors. Thereafter, she remained in Tucson to complete her Internal Medicine residency at Banner University Medical Center. During residency she received several awards including “Intern of the Year” and “Outstanding Resident in Allergy, Immunology, Pulmonary and Critical Care Medicine.” In addition, she was recognized for her leadership and dedication to research with the “Resident Research Distinction Award” and the “Graduate Medical Education Resident Excellence and Leadership Scholarship.” She served as chief resident and clinical instructor from 2014 – 2015. Like Dr. Shimamoto, Dr. Hill completed her Allergy & Immunology fellowship at National Jewish Health and University of Colorado School of Medicine in Denver, Colorado. Dr. Hill has published articles in peer reviewed academic journals, has authored a book chapter on aspirin exacerbated respiratory disease, and has co-authored several research studies. In addition, she has presented on various Allergy and Immunology topics at national and local conferences. She continues to have a strong interest in clinical research.

Dr. Hill is a diplomat of the American Board of Internal Medicine and is board certified by the American Board of Allergy & Immunology. She is a member of the American College of Allergy, Asthma, and Immunology; the American Academy of Allergy, Asthma, and Immunology; and the American College of Physicians. She is currently accepting new pediatric and adult patients. In her spare time, Dr. Hill enjoys bike rides and hiking with her family, cooking, reading, dining out and traveling.

Carly Hopkins


Carly Hopkins was born and raised in Mesa, Arizona. She graduated Cum Laude from Arizona State University where she received a Bachelor of Science in Psychology in 2009. Prior to attending PA school, she worked in inpatient and outpatient radiology settings. She also spent a month in Tanzania, Africa on a medical mission to serve pediatric patients in that region. She then attended PA school at AT Still University and graduated with distinction in 2013. During PA school she was involved in several community outreach and volunteer events providing medical care to those who didn’t otherwise have access to it. After graduating PA school, she spent 4 years practicing Internal Medicine in Chandler AZ. In 2017 she decided to expand her career in the field of Asthma, Allergy and Immunology and joined our team at San Tan Allergy and Asthma. Carly is a nationally board-certified physician assistant, a member of the American Academy of Physician Assistants as well as the Arizona State Association of Physician Assistants. She currently also has memberships with the Arizona Allergy and Asthma Society and the American Academy of Physician Assistants in Allergy, Asthma and Immunology. Carly is married and has two young children (a daughter and a son). She enjoys spending time with family, camping, playing volleyball and traveling.

Kerry Berghoff


Kerry Berghoff, our nurse practitioner, has been working in allergy for almost twenty years. She started out her professional life as a biologist, however, and it took her a few years before she went back to school for her nursing degree. It took ten more years before she would become a nurse practitioner, but she would continue her work in allergy during this time. Patient education is one of her passions as is getting to know patients and their families as they deal with their allergies (and asthma and eczema), improving their health along the way.

Outside of work, Kerry likes to spend time with her husband of 25 years and their six (yes 6) Cavalier King Spaniels. She likes to cook, read, craft, and listen to both music and audiobooks.

Meet Our Staff


LPN, Clinical Manager

Sweney has been a Licensed Practical Nurse since 2013 and has worked in allergy from the start of her career. She has worked for SanTan Allergy & Asthma since 2015. She has worked in the back office with majority of the MDs and worked in both locations. In 2019 she recently took on the position of Clinical Manager and provides oversight to the medical assistants and the nurses in the offices. She has always been passionate about the medical field and knew as a child that she wanted to be in some kind of medical position, but it was not until her junior year in high school that she decided to go into the nursing field. The passion she has had for nursing has only grown since working in the field and she finds it extremely rewarding to provide help and compassion to people that she sees day to day. She could not imagine being in any other field. Sweney was born in California but raised in Arizona most of her life. In her free time, she enjoys spending time with her son, along with traveling when she can. In addition to this, she is very family oriented and loves to hang out with family and close friends.


Registered Medical Assistant

Catherine, RMA is the office biologics coordinator. She has been caring for patients as an RMA in Arizona since 2003. Catherine has worked several years in pediatrics and family practice and has been with San Tan Allergy & Asthma since 2018. She enjoys assisting the patients in our community and prides herself in making every patient feel valued and cared for. Catherine always wants the patient to leave the office having a great experience.

In her free time, Catherine enjoys spending time with her husband and two children, as well as their two dogs. She also has a side business as a portrait photographer and enjoys roller-skating every chance she gets!


Certified Medical Assistant

Jade is Dr. Shimamoto’s Medical Assistant. She is originally from Hillsboro, Oregon but has been living in Mesa, Arizona for about 6 years now. She graduated from her medical assisting program top of her class in 2018 with a 4.0 GPA, then became an AAMA Certified Medical Assistant in 2019, she is also now working towards my BSN-RN degree. In her free time, she enjoys spending time with her daughter who keeps her more than busy and is a fun ball of energy. Growing up she took care of her grandmother who had cancer; therefore, she always knew she wanted to be in the medical field. She loves meeting new patients and getting the chance to hear their story, She always looks forward to growing and delivering the best care she can to her patients.


Medical Assistant

Lynn is the back-office lead at San Tan Allergy & Asthma. She is a true Chicago girl but is happy to be here in Arizona and enjoying the summer sun. She is a driven individual who has found a passion in working with patients. This led her to further develop her skills through an Associates in Science and RMA certification. From direct patient interactions to managing office work she finds fulfillment and value in knowing that she is positively impacting patients. Outside of work she enjoys exploring the world with her mini me, Miliano, her 6-year-old son. Who gives her energy in life, capability to love others, and always enjoy the journey that is next to come. She is happy and hopeful that she can bring a part of her positivity to help you here at San Tan Allergy & Asthma.


Registered Medical Assistant

Marisa Sells is our Serum Manager. She has been with San Tan Allergy & Asthma for 14 years and it gives her joy to know that she contributes to our patient’s allergy/asthma treatment plans. She absolutely loves and enjoys her job. In her free time, she enjoys working with all the wonderful providers and her teammates. She is an Arizona native, and she loves traveling, hiking, reading, yoga, and spending time with her family.


Medical Assistant

Erin is originally from Massachusetts but has lived in Chandler, Arizona most of her life. She started working for San Tan Allergy & Asthma in September of 2020 and is Carly Hopkins Medical Assistant. She has a background working in weight loss/med spa and urgent care settings over the past 6 years. She’s extremely compassionate about patient care and always has great energy with an outstanding bedside manner. In Erin’s spare time she enjoys going to Disneyland as much as possible with her daughter, and she LOVES Starbucks.


Licensed Practical Nurse

Compassionate and dedicated Licensed Practical Nurse with over five years of experience in healthcare.


Registered Medical Assistant

Kathy is a registered medical assistant. She has 12 years experience as an RMA and she has been working at San Tan Allergy & Asthma for almost 7 years. She always try’s to treat patients the way she would want herself or her family treated. She enjoys being a part of San Tan Allergy & Asthma.

Vanessa P.

Medical Assistant

Vanessa “Vee” is a medical assistant who works in our shot department. She has been with SanTan Allergy for a year but has been in the medical field for 18 years. She has worked in Family medicine and urgent care settings in the past.  Vanessa is passionate about her role in the shot department because she is making a difference in helping patients feel better.  Her daily goal is to make people laugh and smile.

Vanessa R.

Medical Assistant

Vanessa R. is a Certified Medical Assistant who has worked for Santan Allergy and Asthma for 2 years. She has worked helping the providers and is now working permanently in the shot department. Vanessa R. is passionate about her role as a Medical Assistant because she is able to help patients feel better and build relationships with them so that they feel comfortable while they are at their visit. Vanessa is looking forward to keep growing with the company.

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our locations

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Gilbert Location

San Tan Map

4915 E. Baseline Road, Suite 112
Gilbert, AZ 85234-2966

480-626-6600 480-626-6604

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Monday-Thursday: 8:00 am – 5:00 pm
Friday: 8:00 am – 3:00 pm

Payson Location

Payton Map

708 S. Coeur D’Alene Lane Suite C
Payson, AZ 85541


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Allergy Injection Hours

8am – 11:30am & 1pm – 4:30pm

8:00am – 11:30am & 1pm – 5:30pm

8am – 11:30am & 1pm – 4:30pm

 8am – 11:30am & 1pm – 5:30pm

8am – 2:30pm

Closed: Saturday & Sunday

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