About Us

Marcann Mental Health provides the highest quality mental health services to adults in Phoenix, Glendale, Sun City West, and Casa Grande area of Arizona. We utilize psychotherapy, medications, and evidence-based therapies to improve overall mental health and function for people living with mental health disorders.
 
The team offers solutions for anxiety, post-traumatic stress disorder (PTSD), and schizophrenia. They work closely with individuals to determine which treatment options are the best fit.
 
The Marcann team also provides comprehensive outpatient care and resources for those struggling with addiction to substances or risky behaviors. They use cognitive behavioral therapy (CBT) techniques to help people make positive changes in their lives and find long-term success in recovery.
 
The providers take a compassionate approach to care and realize how difficult it can be to cope with the impact mental health disorders have on a person’s life. They work closely with each person to understand what’s affecting their mental and emotional wellness so they can create a personalized treatment plan using the latest integrative and holistic approaches.
 
Office hours are available Monday through Saturday (at select locations), and the team can meet with patients virtually through an online video conferencing platform.
 
To schedule a consultation for mental health services, call the Marcann Mental Health office at 602-824-9309 today.

In-Office Providers

Dr. Steve Domann.

Dr. Steve Domann - Clinical Psychologist

Content coming soon!

Jessica Decker - Psychiatric Nurse Practitioner​

Jessica Decker, MSN, PMHNP-BC is a Board Certified Psychiatric Mental Health Nurse Practitioner with Marcann Mental Health. Jessica earned her master’s degree as a Nurse Practitioner with a specialization in Psychiatric-Mental Health across the age span. She is licensed to treat both pediatrics and adults but specializes in care for adults and seniors.

Jessica believes that mental healthcare is a necessary component of wellness. She practices with the belief that treatment will look different for each individual and is a collaboration between the patient and the provider. Treatment of a person’s mental health can include any combination of therapy, medications, and lifestyle.

Jessica looks forward to being a partner with you in your journey to Mental Health Wellness.

Mariza Marcili.

Mariza Marcili - Psychiatric Nurse Practitioner

Content coming soon!

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Laura Holladay - Psychiatric Nurse Practitioner​

Laura Holladay, MSN, FNP-C, PMHNP-BC, is a board-certified Family Nurse Practitioner and Psychiatric Mental Health Nurse Practitioner with more than 25 years of healthcare experience. She has practiced in a variety of healthcare settings across the United States and has proudly called Arizona home since 2014. Laura earned her undergraduate degree from the University of North Alabama, her Master of Science in Nursing and Family Nurse Practitioner training from the University of Alabama in Huntsville, and later received her Psychiatric Mental Health Nurse Practitioner certification from Herzing University. 
 
Laura is passionate about helping adult patients improve their overall health through personalized, evidence-based care. She believes in partnering with patients to address both physical and mental wellness, empowering them to make lasting lifestyle changes that support long-term health and well-being. She is committed to helping patients achieve lasting wellness through compassionate care, practical lifestyle strategies, and individualized treatment plans. 
 
Outside of the clinic, Laura enjoys learning to garden, spending time with her children and grandchildren, and spoiling her Scottish Terrier, Walter. 

Ashley Picone - Psychiatric Nurse Practitioner​

Ashley is a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP) with 23 years of experience as a therapist. Helping others has always been her passion, and she is committed to creating a safe, supportive, and nonjudgmental environment where patients feel heard and understood. Her goal is to empower individuals to improve their mental health, build resilience, and achieve lasting wellness through compassionate, personalized care.
 

Timothy Headley - Psychiatric Nurse Practitioner​

Timothy Headley MSN, PMHNP-BC is a board certified psychiatric mental health nurse practitioner with over 5 years of experience in psychiatric nursing and psychiatry. He is licensed in psychiatric care across the lifespan and provides psychiatric medication management services as well as psychotherapy. Timothy is committed to providing a holistic approach to improving your mental health and reaching your personal goals.

Mobile Providers

Jessica Decker - Psychiatric Nurse Practitioner​

Jessica Decker, MSN, PMHNP-BC is a Board Certified Psychiatric Mental Health Nurse Practitioner with Marcann Mental Health. Jessica earned her master’s degree as a Nurse Practitioner with a specialization in Psychiatric-Mental Health across the age span. She is licensed to treat both pediatrics and adults but specializes in care for adults and seniors.

Jessica believes that mental healthcare is a necessary component of wellness. She practices with the belief that treatment will look different for each individual and is a collaboration between the patient and the provider. Treatment of a person’s mental health can include any combination of therapy, medications, and lifestyle.

Jessica looks forward to being a partner with you in your journey to Mental Health Wellness.

Mariza Marcili.

Mariza Marcili - Psychiatric Nurse Practitioner​

Content coming soon!

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Laura Holladay - Psychiatric Nurse Practitioner​

Laura Holladay, MSN, FNP-C, PMHNP-BC, is a board-certified Family Nurse Practitioner and Psychiatric Mental Health Nurse Practitioner with more than 25 years of healthcare experience. She has practiced in a variety of healthcare settings across the United States and has proudly called Arizona home since 2014. Laura earned her undergraduate degree from the University of North Alabama, her Master of Science in Nursing and Family Nurse Practitioner training from the University of Alabama in Huntsville, and later received her Psychiatric Mental Health Nurse Practitioner certification from Herzing University. 
 
Laura is passionate about helping adult patients improve their overall health through personalized, evidence-based care. She believes in partnering with patients to address both physical and mental wellness, empowering them to make lasting lifestyle changes that support long-term health and well-being. She is committed to helping patients achieve lasting wellness through compassionate care, practical lifestyle strategies, and individualized treatment plans. 
 
Outside of the clinic, Laura enjoys learning to garden, spending time with her children and grandchildren, and spoiling her Scottish Terrier, Walter. 
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Lleva Groves - Psychiatric Nurse Practitioner​

Content coming soon!

Michaela Mathis - Psychiatric Nurse Practitioner​

Michaela Mathis, PMHNP, is a Psychiatric Mental Health Nurse Practitioner with over 15 years of healthcare experience. She earned her Master of Science in Nursing from Eastern Kentucky University, her Bachelor of Science in Nursing from Arizona State University, and her Associate of Science in Nursing from Spokane Community College. Her background includes eight years as an acute care psychiatric RN, two years in skilled nursing, and one year in home healthcare. Michaela is committed to providing compassionate, individualized care and creating a supportive environment where patients feel comfortable and respected.
 
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Nicole Arp - Psychiatric Nurse Practitioner​

Content coming soon!

Ashley Picone - Psychiatric Nurse Practitioner​

Ashley is a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP) with 23 years of experience as a therapist. Helping others has always been her passion, and she is committed to creating a safe, supportive, and nonjudgmental environment where patients feel heard and understood. Her goal is to empower individuals to improve their mental health, build resilience, and achieve lasting wellness through compassionate, personalized care.
 

Timothy Headley - Psychiatric Nurse Practitioner​

Timothy Headley MSN, PMHNP-BC is a board certified psychiatric mental health nurse practitioner with over 5 years of experience in psychiatric nursing and psychiatry. He is licensed in psychiatric care across the lifespan and provides psychiatric medication management services as well as psychotherapy. Timothy is committed to providing a holistic approach to improving your mental health and reaching your personal goals.