About Us

Prism Health offers a safe, affirming, and non-judgmental space where all members of the lesbian, gay, bisexual, transgender, and queer community can obtain the compassionate and culturally effective health care they need and deserve.

We prioritize inclusivity to ensure that all members of the LGBTQ+ community can access affirming and high-quality health care. Patients do not have to be lesbian, gay, bisexual, transgender or queer to receive care, but services will focus on addressing the sensitive issues of sexual and gender minorities and their families and friends.


Miguel David Carreón | DNP, FNP-C, AAHIVS

Pronouns: He, Him, His

Miguel D. Carreón is a certified Family Nurse Practitioner who completed his Doctorate of Nursing Practice (DNP) at Oregon Health & Science University. He is also credentialed as an HIV Specialist through the American Academy of HIV Medicine. He has done research related to PrEP prescribing practices, knowledge, and attitudes among primary care providers, as well as finding innovative ways to promote provider awareness of PrEP through educational opportunities. Miguel was born in Ensenada, Mexico, and is a fluent Spanish speaker. He has lived in Portland since 2012, and in Oregon since 2001. He enjoys travel, as well as staying home and exploring Oregon, and hopes to make it his home for years to come.

Dr. Diana Antoniskis | MD, IDM, AAHIVS

Pronouns: She, Her, Hers

Dr. Antoniskis was born and raised in Nebraska and graduated from the University of Nebraska Medical Center. Her internship was at San Francisco General Hospital during the early years of the HIV epidemic, and she went on to pursue additional training in both Internal Medicine and Infectious Diseases at Los Angeles County/USC Medical Center; she is board certified in both of those specialties. She moved to Portland in 1991 to join Kaiser Permanente, where she worked in the Immune Deficiency Clinic (IDC) and the general Infectious Disease department until her retirement in 2017. During her time at KP, she also served as the Director of Clinical Research for the IDC and was Chief of that department for approximately 10 years. She served as the Director of Operations for Medical Specialties for Northwest Permanente from 2012-2017 in addition to her clinical practice.

Mandy Wilson McKimmy | FNP-C, DNP

Pronouns: She , Her, Hers

Mandy Wilson McKimmy is a certified Family Nurse Practitioner with over 15 years of experience in primary care.  She attended The University of Texas Medical Branch (UTMB) and earned her Bachelor of Science in Nursing in 2000 and her Master of Science in Nursing, Family Nurse Practitioner Track in 2003.  She worked in the Houston area for UTMB in Family Practice and Pediatrics for a number of years before relocating to Oregon.  In 2013 she completed her Doctorate of Nursing Practice (DNP) at The University of Alabama.  She has been working for Oregon Health & Science University for the past six years as an assistant professor in the FNP and DNP programs while continuing to practice in primary care, with a focus on young adults and sexual health.  Mandy has worked closely with doctoral students completing projects on LGBTQ+ health, including the use of PrEP in primary care and working to decrease health care disparities in LGBTQ+ populations in rural Oregon.  In addition to practicing and teaching, Mandy is actively involved in Nurse Practitioners of Oregon and is serving her fourth year as the state representative of Oregon for the American Association of Nurse Practitioners. Mandy and her partner have six children and enjoy spending time as a family doing outdoor activities such as wake-boarding, hiking, camping, and skiing.

Danielle Walsh | LPC

Pronouns: She/Her/Hers

Danielle Walsh is a licensed professional counselor who is passionate about providing culturally competent, trauma-informed mental health services to the LGBTQ+ community. She holds a masters degree in pastoral counseling from Marymount University and recently completed a post-graduate certificate program in sexual health from the University of Michigan, specializing in sex therapy. Danielle has experience working with trans and gender non-conforming clients, and addressing issues related to religion and spirituality, sexuality, grief and loss, and trauma. Danielle recently moved to Portland from Boise, Idaho and enjoys biking, thrift store shopping, and spending time with her cat, Puff. For more information about their approach to mental health practice please click here.

A. Michael Duncan | PsyD

Pronouns: He/Him/His

Mike Duncan is a licensed psychologist who completed his doctoral degree in clinical psychology at Pacific University in Hillsboro, Oregon.  He received his bachelor’s degree in psychology from the University of Colorado at Boulder.  He has a generalist background in mental health working with ages 12 and up, in group, individual, family, and crisis therapy, in community outpatient and residential settings, and with a broad range of diagnoses and treatment needs.  He has performed research regarding sexual minority adolescent risk and protective factors in addition to internalized sexual prejudice and sense of belonging in sexual minorities.  He has lived in the Portland area since 2011 and enjoys yoga, bicycling, and exploring the Pacific Northwest. For more information about their approach to mental health practice please click here.


Caitlin Wells | Director of Healthcare Operations

Pronouns: She, Her, Hers

Caitlin Wells is the Director of Healthcare Operations at Prism Health. In her role she supports preventative health programs at both Prism and Cascade AIDS Project. Caitlin’s passion and commitment lies in delivery quality health services to local communities specifically focusing on HIV, STIs, and sexual health. With this focus, her experience includes work with government agencies and non-profits in both international and local settings. Prior to arriving at Cascade AIDS Project, Caitlin worked with Mercy Corps, an International NGO that works in the world’s most challenging places to provide the right resources for people to transform their lives. Caitlin has also worked in state government level managing the Iowa AIDS Drug Assistance Program that provides HIV medications to low income individuals. Caitlin served in the Peace Corps in Botswana, Africa for two years working at the local government level supporting HIV prevention providers. As a Peace Corps Volunteer she supported community HIV testing events, Prevention of Mother to Child Transmission (PMTCT) programming, and psychosocial support to HIV+ youth.

Tyler TerMeer | Executive Director

Pronouns: He, Him, His

Tyler TerMeer is Executive Director of Cascade AIDS Project, the oldest and largest community-based provider of HIV services in Oregon and SW Washington and Prism Health.  Tyler graduated from Otterbein University with a BFA in Theatre Design Technology, fully intending a career in theatre management. However, after testing positive for HIV in 2004 and experiencing the support and expertise of a local AIDS service organization, Tyler turned his efforts toward helping others living with HIV and advocating for strong, effective HIV policy.  He earned an MS in Nonprofit Management and Organizational Leadership from Walden University, and he also graduated from the UCLA / Johnson and Johnson Health Care Executive Management Program. He is currently pursuing his PhD in Public Policy and Administration.

Will Lay | Patient Services Coordinator

Pronouns: He, Him, His

Will Lay has a professional background in healthcare administration in primary care and mental health services. After leaving the US Army, he earned a B.S. degree in Social Science with a focus on clinical counseling and psychology from Portland State University. Will has lived in the Portland area for 8 years and grew up in Eugene, Oregon. An avid adventurer and outdoorsman, Will loves traveling all over the world to scuba dive and explore other cultures and countries. With a strong desire to help others, whether through social activism or just being a friendly face on the street, Will is always focused on giving 100% of himself to those he serves.