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Roy Frieband, DO

Executive Medical Director

Dr. Frieband received his Bachelor of Science degree from the University of Arizona, his medical degree from University of Medicine and Dentistry of New Jersey-School of Osteopathic Medicine, he completed a rotating internship at Atlantic City Medical Center in Atlantic City, NJ, and he completed a family practice residency at Memorial Hospital in York, PA. He received a Master's of Science degree in Medical Informatics from the Arizona School of Health Sciences and he is board certified in family practice.

Expertise and interest in the use of and integration of computers in medicine to improve both the health of the individual patient and groups of patient populations, Dr. Frieband is dedicated to the patient centered medical home model of health care, while at the same time always focusing on the needs of the individual patient. He is always striving to make the health care experience simpler, better, higher quality, and more satisfying for both patients and doctors alike.

He has worked in a variety of practice settings including solo practice, community health, rural health, hospital system and large group practices. Outside of the office, he enjoys computer programming, web site design and development, sports, music, and travel.


Shari Castle, RN-C, BSN

Health Center Manager

Shari Castle has been a registered nurse for 17 years, and is board certified in Ambulatory Care Nursing. Throughout her nursing career, she has focused her practice in the urgent care and internal medicine settings. Shari joined Premise Health as the Health Center Manager for the Intel Arizona sites in 2013. She and her Husband of 31 years have two grown children who live in Michigan. During her time away from the office, Shari enjoys traveling to Michigan to visit her kids and family along with caring for their 7 husky rescues at her home in Arizona.

Wendy Woodward

Health Center Manager

Wendy Woodward is a registered nurse with a certification in rehabilitation and wound care. Over her 38-year career she has worked in a variety of health care settings to include managing a primary care family practice, managing an orthopedic surgical practice and managing an in-patient ventilator dependent rehabilitation unit. Wendy returned to primary care in January of 2012 as the health center manager for the Intel Ronler Acres Health for Life Center. In September of 2013, her managerial role expanded to include the Jones Farm Health for Life Center.  Her love has always been family practice and the relationships that develop with patients and families within the medical home. When not onsite at the clinics, Wendy enjoys spending time with her family, sailing with her husband on their 36-foot sailboat and hiking with her retired therapy dog, Abbey Marie. 

Arizona Caregivers


Linda Landino, DO

Medical Director

Dr. Landino is a Board Certified Family Practice physician since 2002. Originally from Pennsylvania, she attended Bucknell University for her undergraduate degree and then Philadelphia College of Osteopathic Medicine with an early decision admittance. Prior to attending medical school, she worked on a cruise ship and traveled throughout Western Europe. She completed her residency at Phoenix Baptist Hospital and Family Medicine Center and fulfilled her requirements for a National Health Service Corp Scholarship at two community health centers. During this time, she acquired Spanish language skills. Last summer, she traveled to Bagdad, Iraq and provided medical services to a multi-cultural population from all over the world. Most recently, she has been working in urgent care medicine and supervising some medical research based activities. She is looking forward to returning to a primary care environment focused on health and wellness. She has a special interest in weight loss medicine and lifestyle modification.


Laura Leal, NP

Nurse Practitioner

Laura Leal, FNP-BC is a board- certified nurse practitioner. She received her Bachelor of Science in nursing in 2003 specializing in critical care. From there, she earned a Master's of Science in Nursing - Nurse Practitioner degree at Grand Canyon University in 2010. She has been serving the community in a family practice setting since that time. She is currently completing her doctoral studies at Arizona State University. Laura is passionate about family practice and preventative medicine, caring for all ages and populations. She practices patient-centered care which is based on deep respect for patients as unique living beings, and the obligation to care for them on their terms. Laura enjoys biking for fitness, interior design, crafts and religious studies. She lives in Gilbert with her family that includes her husband, two girls, and her two puppies Koda and Zoe.

David Bone, PA-C

Physician Assistant

David is a board certified physician assistant. He received his Master of Science in Physician Assistant Studies from A. T. Still University in 2005. His clinical focus is in general internal medicine and family practice. David lives in Gilbert with his wife, son, two dogs, and three cats. His other hobbies include playing city league basketball, tennis, and golf. David is very excited to be joining the Premise Health team and working with the Intel employees and their families.

Oregon Caregivers


Adam Frederick, MD

Medical Leader

Adam Frederick is a board certified family medicine physician. He completed his medical training at Albany Medical College in New York and his residency at the University of Utah. As a recent transplant from southern California, he is looking forward to experiencing four seasons and doing more camping, hiking, running and biking. When not at work he enjoys spending time with his wife and two children as well as their golden retriever exploring the outdoors and particularly national parks. His clinical interests are sports medicine, preventive care and educating patients so that they can live their best lives and be collaborative in their medical care.


Margaret Upton, NP

Nurse Practitioner

Margaret Upton is a Board Certified Family Nurse Practitioner. She received her MSN from the University of Missouri-Columbia. She has been practicing for more than 25 years. Clinical interests include health promotion, disease prevention, woman’s health, travel health and adolescent and young adult health. She and her husband have two college-aged children. Her hobbies include tandem cycling, reading, and hiking. Margaret is looking forward to working with the Intel Employees and their families to assist them in their health and wellness goals.


Daniel Twombly, MD

Medical Provider

Dr. Twombly received his M.D. degree from Baylor College of Medicine and completed his residency training in Family Practice at the Kaiser Foundation Hospital in Fontana, California. He is board certified by the American Board of Family Medicine and is a Diplomat of the American Academy of Family Physicians. His clinical interests include health promotion, disease prevention, evidence-based medicine and the role of exercise and nutrition in maintaining health. He and his wife have two grown daughters. When not at Intel, he enjoys running, playing music, and working on a four acre horse farm that he shares with his wife in Oregon City. He is looking forward to working with Intel employees and their families, assisting them to be as healthy as they can be.

Holly Schaaf, RN


Holly Schaaf is a registered nurse, certified in emergency nursing. She graduated from the University of Maryland, School of Nursing in 1999 and began her career as an ER nurse at Oregon Health & Sciences University. Holly has worked at the Ronler Acres Health for Life Center since it opened in 2012. The combination of clinical experience, education and passion to teach has recently led Holly into the role of Condition Management nursing at the Health for Life Centers located at Jones Farm and Ronler Acres. As the condition management nurse her role is to teach patients about their disease process and empower them in the modification of health related behaviors which will in turn help to reduce the occurrence or severity of chronic disease processes.


Sonja Skovsted, PA-C

Physician Assistant

Sonja Skovsted is a Nationally Certified Physician Assistant. She received her undergraduate degree from Eckerd College in St. Petersburg, Florida with a Bachelor’s of Science in Biology and graduated in 2009 from Pacific University in Forest Grove, Oregon with a Masters’ of Science in Physician Assistant Studies. Since then, she has practiced in pediatrics, urgent care/family medicine and orthopedics. She is excited to be part of the Intel team and practicing medicine in an on campus outpatient health clinic. In her free time, she enjoys spending time with her two young children. Her clinical interests include orthopedics and sports medicine, pediatrics and working as a team to create the best medical care possible for each individual patient.


Jennifer Layosa, DO


Jennifer Layosa, OD was born and raised in Kaneohe, Hawaii. After pursuing an undergraduate degree from Oregon State University in Exercise and Sport Science, she went on to receive her Doctor of Optometry degree from Pacific University in 2009. Since graduating she has worked in various settings throughout Oregon and joined the Health for Life Vision Center in 2015. In her spare time she enjoys spending time with her husband and 2 young children exploring the Oregon coastline and all that it has to offer.