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Our Team

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Nicole Humphrey, MSN, PMHNP-BC
Nurse Practitioner

I am a board-certified psychiatric mental health nurse practitioner. I obtained my Master of Science in Nursing from the University of Colorado. Prior to obtaining my master's degree, I worked as a Registered Nurse for nearly 10 years in a variety of settings including inpatient care, emergency care, and inpatient psychiatric care, to name a few. As a psychiatric nurse practitioner, I have worked in outpatient services, crisis services, and Telehealth.

I understand that making the decision to try medication can be a very difficult process. I consider medication to be one of many tools that we can utilize, but I also believe that it is important to incorporate non-medication options to optimize treatment. I routinely utilize evidence-based practice methods, shared-decision making, and goal-setting techniques to ensure that we are always on the same page about your treatment goals. I look forward to collaborating with you!

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Nurse Practitioner

Providing personalized and results-oriented mental health care is my passion. I am a board-certified psychiatric nurse practitioner with a diverse psychiatric background in inpatient, outpatient, and emergency environments. I graduated from Baylor University with a Bachelor’s of science in nursing and completed a Master’s of science in nursing from Regis University.

Active listening during our sessions allows me to understand my clients beneath the diagnosis. Addressing your physical, emotional, and spiritual needs is imperative in understanding you as my client. During our meetings, I will create a collaborative space to formulate treatment planning together. As a life-long learner, I commit to applying evidence-based practice treatments to ensure high-quality care.

I seek to provide an inclusive and safe atmosphere to cultivate a meaningful client-provider relationship. My ultimate goal is to highlight your strengths and to foster self-discovery, healing, and relief of symptoms. I would be grateful to be a part of your mental health journey.

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Weichen (Sabrina) Chen, MSN, PMHNP-BC
Nurse Practitioner

Since 2013, I have assisted clients in recognizing how their past affects their present physical and mental health. My goal is to help my clients restore their mental wellness. Working collaboratively, you and I will create a personalized treatment plan to meet your unique needs and circumstances. Because medication can only relieve symptoms and not make one's life better and more meaningful, we will take a holistic approach to your treatment.

I am looking forward to meeting with you so we can work together to help you heal.

Shannon Keane, MSN, PMHNP-BC
Nurse Practitioner

I am a board certified family medicine nurse practitioner with specialities in Family Medicine and Psychiatry. I earned my Master's in 2018 from the University of Colorado - Colorado Springs. 

I offer you a holistic approach to managing your mental health, utilizing evidence based, realistic, comprehensive strategies to improve and maintain your mental health. I believe that to heal mental health conditions, and to reach an optimal state of wellbeing, you have to take care of your physical body, mind and soul. I advocate optimizing brain health through nutrition, movement, supplements, medications, meditation and other alternative therapies. By using a multimodal approach, my priority is to help you achieve a balanced state of wellbeing.


I am a family nurse practitioner with prescriptive authority. I see patients across the lifespan helping them understand and treat a variety of mental health issues.

Paige Cool, MSN, PMHNP-BC
Nurse Practitioner

I am a board certified psychiatric mental health nurse practitioner and I obtained my Master's degree at University of Rochester. Prior to my career as a nurse practitioner I worked on the inpatient child and adolescent psychiatric unit as a nurse. I also have experience in outpatient clinics, adult inpatient settings, long-term treatment centers, and partial hospitalization programs. I provide medication management to clients across the lifespan.


My goals are to create a supportive and safe environment where a therapeutic relationship can be fostered and filled with respect, trust and understanding. I utilize evidence based practice in treating clients while creating an open and collaborative approach in order to determine the best treatment options. I look forward to meeting you!

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Charlisa Davenport, MSN, PMHNP-BC
Nurse Practitioner

I am a board certified Psychiatric Mental Health Nurse Practitioner. My goal is focused on empowering individuals and helping them navigate the complexities of life. I believe in building partnerships and creating a safe, nonjudgmental environment. I’m especially committed to providing compassionate, holistic care that is patient centered and based on your unique needs and concerns.

I specialize in providing mental health treatment across the lifespan through psychiatric evaluations, medication management, and brief psychotherapy. While medication can be beneficial in many cases, I truly believe the best approach to treatment also includes a combination of lifestyle modifications, therapy, and assessing social support systems.

I look forward to working together to restore balance to your life and create a positive foundation for your overall mental health and wellness!

Elizabeth DePalma, DNP, PMHNP-BC
Nurse Practitioner 

I am a doctorally prepared, board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP) dedicated to providing exceptional mental health care to clients across the lifespan. I have been working in healthcare for over 14 years, with the past 9 years focused on mental health treatment in both inpatient and outpatient settings. I graduated from the University of Colorado Anschutz Medical Campus in 2018 with a Master of Science in Nursing, and then went on to complete my Doctor of Nursing Practice degree in 2019. I am also a US Air Force veteran, where I worked to provide mental health care for active-duty service members.

My mission as a PMHNP is to help my patients process their unique mental health challenges, manage symptoms, and build a life they feel is worth living. Together, we can achieve these outcomes by using evidence-based treatments, including targeted medication management, brief psychotherapy, and multidisciplinary referrals to ensure holistic care. I believe it is important to consider the many aspects of your health when collaborating to create a personalized treatment plan.

I look forward to working with you on your mental health journey.

Erica G Reiff, MSN, PMHNP-BC
Nurse Practitioner, Clinical Director 

I am a board-certified psychiatric mental health nurse practitioner in private practice in Denver, Colorado. I earned my Bachelor's of Science in Nursing from Regis University and my Master's of Science in Nursing from the University of Colorado College of Nursing specializing in mental health across the lifespan.


I have over a decade of experience in the field of mental health working with adults and adolescents. I work collaboratively with patients to optimize a patient's ability to function in the world and to meet patient-identified goals of treatment. I prioritize education so patients are able to make informed decisions in a judgement-free atmosphere.


When not working, I enjoy spending time with my family, cooking, watching soccer (Go Rapids!) and getting outside in beautiful Colorado!

I am not currently taking new patients.

Eric Reiff, Ph.D.
Practice Manager

I have a varied background. A Bachelor's in Biology, a Master's in Global Finance, Trade and Economic Integration, and a Ph.D in Geography. I have worked in construction and financial IT project management and as an Instructor at CU Boulder for 9 years. My passions are education and problem solving and I am pleased that I am to fulfill these passions through my work at Reiff Mental Health. 

When I'm not working or chauffeuring my daughters, I like to camp, hike, fish, make and eat great food, and watch soccer.

Lisa Reiff
Assistant Practice Manager

have a Bachelor of Science in Business Administration and for the past 10 years have worked in various capacities as a licensed insurance agent. Much of my free time involves grooming dogs for family and friends, fostering dogs through a local pet rescue and caring for our three dogs. I enjoy hiking and spending time with my family as well as the occasional music festival. 

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