Brief Biography:

Dr. Guillen has worked in medicine and healthcare administration for over thirty-five years. He is known as an innovator in the field of healthcare delivery. His mission is to integrate the mind and body by offering the best-in-class evidence-based clinical care, staying up to date engaging the global scientific community in visionary research to discover more effective treatments, and educating and empowering patients by providing trustworthy information and resources.

Dr. Guillen completed his psychiatric residency at the Menninger Department of Psychiatry at Baylor College of Medicine in Houston, Texas.  During those four years, he had the advantage of working at the Texas Medical Center in Houston, one of the largest and most diverse medical centers in the world. The experience of rotating through seven of the affiliated hospitals enabled him to obtain broad-based training and develop competency in a wide spectrum of treatment modalities in the county, federal, and private non-profit settings, comprised of multi-ethnic populations from different socioeconomic backgrounds. Dr. Guillen went on to complete a subspecialty fellowship in Child and Adolescent Psychiatry at the University of Miami Miller School of Medicine Jackson Memorial Medical Center, a program that emphasizes the treatment of patients and families through a continuum of care, based on a developmental perspective combining psychodynamic, psychosocial, biologic, behavioral, and cognitive approaches.

Dr. Guillen held an academic position as Assistant Professor of Psychiatry at the State University of New York Upstate Medical University from 1999 to 2003. He served as Medical Director of the Comprehensive Psychiatric Emergency Program for United Health Services Hospitals. He has received several distinguished awards from the American Psychiatric Association. Dr. Guillen has lectured extensively both nationally and internationally. His areas of interest are the long-term course of psychiatric illness, including psychotic disorders, mood disorders, and anxiety disorders, and the impact of neuropsychopharmacology compounds on the clinical course of these illnesses. Dr. Guillen has conducted and published research on atypical antipsychotic use in adolescents with a spectrum of psychotic disorders.

Dr. Guillen was Chief Medical Officer for People of Color Network for eight years an integrated community healthcare network of impressive, quality-focused, community‐based organizations with a successful history of delivering culturally responsive services for diverse communities throughout Arizona.

Dr. Guillen was the former Chief Medical Officer for Southwest Behavioral & Health Services for 3 years, a large non-profit organization whose mission is to seek solutions, create change, and offer evidence-based clinical care to the underprivileged with severe mental illness through culturally and linguistically responsive care coordination. He has been at the forefront of public education to dispel the myth and stigma surrounding children, adolescents, and adults living with psychiatric disorders. He operationalized the implementation of integrated healthcare management and administration at all clinic sites throughout the state of Arizona, ensuring that all patients have access to high-quality integrated healthcare in an empathic and patient-centered environment.  Dr. Guillen also developed and established the Southwest Autism Center of Excellence, the first of its kind in the state of Arizona. 

Dr. Guillen for six years served as Chief Medical Officer for Chicanos Por La Causa, (CPLC) the largest nonprofit organization in the State of Arizona which was founded in 1969 as part of the movement led by Cesar Chavez to confront the oppression of Latinos in Phoenix, Arizona. Since then, CPLC has become one of the largest Hispanic nonprofits in the country, promoting stronger and healthier communities throughout the southwestern United States. The vibrant CPLC community spans a comprehensive range of bilingual and bi-cultural services in Health & Human Services, Housing, Education, and Economic Development. CPLC provides services in the state of Arizona, Nevada, New Mexico, and Texas. 

Dr. Guillen currently serves as Chief Medical Officer for Lifewell a non-profit integrated healthcare agency providing treatment, services, and support for low-income clients diagnosed with serious mental illness (SMI), general mental health issues, and substance abuse disorders. Lifewell offers residential, outpatient, and community living programs, which are client-centered and adapted to address a broad range of needs.

Dr. Guillen has been in Private Practice with his wife, Marilyn Pupo-Guillen, MD since 2004 in their Scottsdale office.