Perfiles de preceptores y residentes
We invite you to meet our preceptors and current pharmacy residents who are continuing their education by completing their PGY1 program at Onvida Health.

Rashad Dhaifallah A Allahyani, Pharm.D.
Residente de Farmacia PGY1
Rashad was born and raised in Saudi Arabia, where his passion for pharmacy began. He earned his first Doctor of Pharmacy (Pharm.D.) degree from King Abdulaziz University in 2016. After graduation, he worked in a community pharmacy for two years. Driven by a desire to play a more active role in patient care and collaborate with healthcare teams in hospital settings, Rashad pursued further opportunities in the United States. In 2024, he earned his Pharm.D. degree from the Massachusetts College of Pharmacy and Health Sciences. He then joined the PGY1 Pharmacy Residency Program at Onvida Health, where he continues to advance his clinical expertise. Rashad’s professional interests include critical care, infectious disease, and cardiology.
Outside of his professional life, Rashad enjoys watching movies and TV shows, cooking, fishing, and bowling.
Leyah Nguyen, Pharm.D.
Residente de Farmacia PGY1
Leyah Nguyen was born and raised in the Philippines and moved to the United States in 2005. She began her pharmacy career as a technician, where she developed a desire to contribute more directly to patient care, leading her to pursue a Phar.D. degree at Roseman University of Health Sciences, Nevada. Inspired by her APPE rotations in critical care and ambulatory care, she was drawn to these specialties, recognizing the significant impact pharmacists can have on patient outcomes.
Outside of her professional work, Leyah enjoys spending time with her family and their dog, Miloh, often going on walks and outdoor adventures. She is also passionate about hiking and traveling, making the most of her free time exploring new places.

Perfiles de los preceptores
Our preceptors bring a broad range of skills and experience to the Onvida Health Pharmacy Residency Program. They share their knowledge and expertise to help our residents build their knowledge, skills and abilities in delivering patient-centered care as clinical pharmacists in an acute care setting.

Mark Jordan, Doctor en Farmacia
Director Administrativo de Farmacia
Mark Jordan is a proud graduate of the University of Arizona in Tucson, AZ, having earned both Doctor of Pharmacy and Bachelor of Arts in Education degrees. He joined the Onvida Health staff in 2001 as a clinical pharmacist after previous work as an educator in the Yuma public schools. At Onvida Health, Mark has provided service across all levels of patient care, from critical to transitional care units. He has been involved in the palliative care team and the development of the ICU specialist position. As a NICU liaison, he accomplished the standardization of orders and preparation procedures for medications used in the NICU. His experiences at Onvida Health, as a pharmacy director for an inpatient rehabilitation hospital, a consultant pharmacist for local skilled nursing facilities as well as a free-standing endoscopy center provide a rich background for student and resident learning. Mark has called Yuma home since 1975 and enjoys our desert community with his wife and young children.
Stephanie Kehle, Farmacéutica
Director del Programa de Residencia de Farmacia
Stephanie, raised in Yuma, began her career as a pharmacy technician while she pursued her college education. In 2005, she received her Doctorate of Pharmacy from Midwestern University College of Pharmacy Glendale. Following her education, she dedicated 11 years to working in a community pharmacy before returning home to Onvida Health. Since 2016, Stephanie has been an integral part of our team as the Anticoagulation Clinic Pharmacist. Outside of work, she enjoys activities such as CrossFit, gardening, grooming her dogs and spending time with her loved ones.


Jean-Paul "JP" Q. Lee, Doctor en Farmacia, MBA, BCPS, BCSCP
JP graduated from the University of California, San Diego with a Bachelor of Science in Biochemistry and Cell Biology. He previously worked as a research associate at a large public teaching university conducting a cystic fibrosis study before joining a global biotech company as a biochemist. While at the biotech company, he took advantage of their education reimbursement program and earned a Certification in Planning and Inventory Management from the American Production and Inventory Control Society and a Master of Business Administration with a concentration in Technology Management from the University of Phoenix. He then combined his science background and business knowledge to help implement their new enterprise business system as a business analyst. After several years in the biotech industry, he went back to school and earned a Doctor of Pharmacy from Creighton University prior to joining the Onvida Health pharmacy team. His diverse professional background in business process analysis, continuous improvement, research and inventory and production management provides a unique perspective for pharmacy students and residents on their rotations. Outside of work, JP enjoys cooking, reading, traveling and spending time with his family and friends.
Ania Mathews, Farmacéutica
Ania se licenció en Antropología por la Universidad de Arizona y obtuvo un máster en Educación por la Universidad de Massachusetts en Amherst. Fue maestra de escuela pública en Yuma antes de recibir su Doctorado en Farmacia de la Universidad de Nuevo México en 2014. Después de trabajar como farmacéutica de personal clínico en la zona rural de Wyoming, regresó a Yuma para unirse al equipo de Farmacia en 2020. Sus intereses profesionales incluyen anticoagulación, cardiología y nefrología. Cuando no está en el trabajo, le gusta la actividad física en interiores y al aire libre y pasar tiempo con su familia.


Denisse Garcia Zavala, Pharm.D.
Denisse received her Doctor of Pharmacy degree from Midwestern University – College of Pharmacy in Glendale, AZ. She completed her a PGY1 Pharmacy Practice residency at Onvida Health and joined the Onvida Health pharmacy team afterwards. Denisse’s professional interests include internal medicine, infectious disease, and geriatrics. In her spare time, Denisse enjoys building legos, yoga/pilates, and watching movies with friends and family.
Quan Pham, Doctor en Farmacia, BCPS
Quan graduated from the University of California San Diego with his Bachelor of Science in pharmacological chemistry in 2009. He worked in a contract manufacturing company for three years before completing his Pharm.D. from Midwestern University – Glendale, AZ campus in 2015. He completed his PGY1 community residency in Flagstaff, AZ at North Country Health Care, where he also earned a teaching certificate from Midwestern University – Glendale AZ campus. Quan joined Onvida Health in Agosto 2015 and has been providing patient care in various settings, including the anticoagulation clinic, the cancer center and inpatient as a clinical pharmacist. Quan’s interests include playing guitar, photography, and exploring the great outdoors.


John Zackary Riddle, Doctor en Farmacia
Supervisor de Operaciones de Farmacia Oncológica
Zack Riddle es originario de Thatcher, Arizona. Recibió su Doctorado en Farmacia de la Facultad de Farmacia de la Universidad de Arizona en Tucson, AZ en mayo de 2016. Sus intereses profesionales incluyen enfermedades infecciosas, atención ambulatoria, medicina interna y cuidados críticos. Al completar su residencia PGY1, Zack espera trabajar en un hospital comunitario rural y ayudar a preceptuar a estudiantes y futuros residentes. Fuera de la farmacia, Zack le gusta jugar al tenis, jugar juegos de mesa con sus amigos y familiares y visitar la playa.
Hailey Wang, Farmacéutica, BCPS
Hailey received her Doctor of Pharmacy degree from the University of Southern Nevada in Henderson, NV in 2010. Hailey worked as a clinical staff pharmacist for six years in Chadron, NE and joined the Onvida Health pharmacy team in 2016. Her professional interests include infectious disease, critical care, internal medicine and palliative care/hospice. In her spare time, Hailey enjoys yoga, travel, watching movies and spending time with friends and family.


Rachel M. Belcher, Farmacéutica, BCCP
Rachel received her Doctorate of Pharmacy from Roseman University of Health Sciences in South Jordan, UT in 2020. Thereafter she completed a PGY1 Pharmacy Practice and PGY2 Critical Care Pharmacy Residency at Intermountain Medical Center in Murray, UT, followed by a Critical Care and Infectious Diseases Pharmacotherapy Research Fellowship at the University of Illinois Chicago. Rachel is board certified in critical care. In Julio 2023, Rachel joined Onvida Health as a Critical Care Clinical Pharmacy Specialist. Her clinical and research interests include optimization of medication therapy in critically ill patients, antimicrobial resistance and stewardship, liver failure, toxicology, and trauma. In her spare time, Rachel enjoys spending time outdoors, traveling, exercising, and spending time with family and friends.
Banin Alqadheeb, Doctor en Farmacia, BCPS
Banin received her Doctorate of Pharmacy from King Faisal University in Saudi Arabia in 2015. Then, she completed the Advanced Clinical Pharmacy Practice Graduate Certificate Program at the University of Arizona in 2019. Thereafter she completed a PGY1 Pharmacy Practice at MelroseWakefield Healthcare in Melrose, MA, followed by a PGY2 Ambulatory Care Pharmacy Residency at the University of Arizona in Tucson, MA. Banin is board certified in pharmacotherapy. In Septiembre 2023, Banin joined Onvida Health as a Clinical Pharmacist. Her clinical and research interests include diabetes management, diabetes technologies, and social determinants of health. In addition to her interest in psychiatry and management of chronic disease with mental health. Outside of work, Banin enjoys spending time outdoors, traveling, cooking, and spending time with her family.
