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West Des Moines Therapy Staff


Heidi Vermeer-Quist, PsyD
Clinical Director and Lead Clinician

Dr. Heidi Vermeer-Quist is a licensed clinical psychologist with over 20 years of clinical, teaching and consulting experience. One of her core passions is to serve the Christian church with best practices of psychology.  


Heidi earned her Doctorate in Clinical Psychology from Wheaton College in 2002 and helped establish and build the Pine Rest Des Moines Clinic, serving thousands of patients in Central Iowa for 16 years. Heidi and her husband, Chad Quist, transitioned the Pine Rest Des Moines Clinic to Heartland Christian Counseling in 2018. She has provided psychological assessment and psychotherapy to people struggling with depression, anxiety, relational conflicts, trauma recovery, unresolved grief and adjustment, and personality disorders. In addition to her clinical training, Heidi also has obtained specialized training and extensive experience in Organizational Psychology and Family Business Governance. She has served Vermeer Corporation in various family governance roles, including serving on the Board of Directors. She continues to provide clinical services through Heartland Christian Counseling, as well as, family business and organizational consulting services through Heidi currently serves on the Iowa Board of Professional Psychology. 


Heidi recently released the first two books of a three-book personal growth series called Gardening Your Life. The first book, Grounding, and the second book, Grieving, are workbooks (ideal for small groups) that integrate the best practices of the field of psychology with solid Christian teaching. 


Personally, Heidi enjoys singing, raising their three amazing kids with Chad, and participating in the joy of each God given moment (though she is still learning how to do this!).  


Amy Deace, LMHC

Amy is a temporary Licensed Mental Health Counselor. She has a masters degree in Biblical Counseling from Luther Rice Seminary and a masters degree in Clinical Mental Health from Liberty University. She counseled through the church for many years before coming to Heartland in late 2020.

Her passion is in marital counseling, specifically with emphasis on sexual issues and also with counseling women with anxiety and depression. She is working on certifications with Gottman and is trained in EMDR. 

She is also a CSAT-Candidate and can see those seeking help for sexual addiction (and their partners). 

Amy lives outside of Des Moines with her husband and three children.

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Amy Elliott, LISW

Amy is a Licensed Independent Social Worker. She received her Bachelor of Arts degree in Sociology from Simpson College and her Master of Social Work degree from the University of Iowa School of Social Work.

Prior to joining Heartland, her work included residential treatment, outpatient therapy, school-based therapy, school social work, crisis pregnancy support, and youth ministry. Amy has experience providing services for children, teenagers, and adults with a variety of concerns. She uses an integrated therapeutic approach and her areas of clinical interest include anxiety, depression, emotional regulation, trauma, grief and loss, and difficult life changes/transitions.

Amy has experienced God’s grace and hope throughout her own journey, and she considers it an honor to walk alongside others on their paths of growth, healing, and wholeness.

Amy enjoys reading, music, traveling, and spending quality time with her family and friends (especially in the mountains, on a walk, at a new restaurant, or over a cup of coffee).


Barbara J. Graham, LISW

Barbara is a Licensed Independent Social Worker and has been in practice for over 35 years. She received her bachelor’s degree from ISU and her master’s degree from University of Iowa School of Social Work.


Her passion is to help people find healing from trauma, chronic pain, suffering and grow in God’s healing presence in their lives. She uses an integrative approach to trauma using body, mind, emotions and spiritual healing. She has been trained to use EMDR, body-sensory awareness, emotional regulation, IFS, application of relaxation skills, guided imagery, nutritional connections to mental health and identity-relational tools to help people heal.


She has been married for 31 yrs. to Gordon and they have four adult children and one grandson. She enjoys music, theatre, reading, canning, soap making, bike riding and camping. She and her husband live on a 50-acre natural farm with chickens, cows, goats, honeybees, fruit trees and a raspberry patch.


She tries to live simply, lovingly, with great laughter and zeal for an adventurous life with the Lord.


Avery Harshman, LMFT

Avery is a Licensed Marriage and Family Therapist. She received her Bachelor of Arts degree in Psychology from the University of Iowa and her Master of Arts in Marriage and Family Therapy from Bethel Seminary. 

Prior to joining Heartland, her previous work includes working in a variety of different therapeutic environments, including outpatient mental health in substance abuse recovery programs, schools and therapy clinics.  She has provided individual, couples and group therapy. 

She is thankful for the sure foundation she has in Jesus Christ and for the hope He gives those in need. Avery desires to create a safe environment and work and walk alongside all who enter her office in the messy and beautiful seasons of life.  She uses an integrated approach to therapy. Her areas of clinical interest include teen issues, grief and loss, depression, anxiety, relationship conflict, adjustment disorders, peer struggles and spiritual issues. Avery works with teenagers and adults of all ages. 

Avery spends her time at home with her husband, son and cat. She enjoys time with loved ones, watching her favorite shows/movies, playing music, frequenting local ice cream shops and traveling.

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Drew Doig, T-LMFT

Drew recently completed his master's degree in Marriage and Family Therapy from Liberty University.  Prior to his graduate program he received his bachelor's degree in social science education from the University of Northern Iowa.  Prior to becoming a marriage and family therapist Drew was a middle school social studies teacher. Drew loves working with individuals, adolescents, and families to help navigate whatever difficulties it is that they are facing.  Drew believes that it is through open understanding, and creating a safe space, that the client and clinician can really complete the work.  It is Drew’s goal to create a relationship and space where the client can explore their physical, emotional, mental, and spiritual well-being. Drew likes to focus on cognitive behavioral therapy, focusing on how our thoughts, emotions, and behaviors are all intertwined.   

When not working, Drew enjoys hanging out with his family consisting of his wife, their two sons, and dog.  They spend a lot of time together as a family doing various activities.  Drew loves sports and being outdoors.  He tries to get on the golf course as much as he can, or just being outside with his family in general. 


Gabrielle Llewellyn, T-LMFT

Gabrielle is a temporary licensed Marriage and Family Therapist. She has a bachelor’s degree in Child, Adult, and Family Services from Iowa State University and a master’s degree in Marriage, Couple, and Family Counseling from Regent University. She has been at Heartland since her internship experience in 2022.

Gabrielle believes that God’s desire for each person is that they would “have life and have it abundantly” (John 10:10). Her relationship with God, the ultimate Comforter, has been foundational in her pursuit of a career in counseling. Gabrielle approaches healing from a holistic perspective. She enjoys using emotion-focused modalities in the therapy setting as well as equipping clients with practical tools to be utilized at home. She helps individuals and couples navigate challenges such as trauma, anxiety, depression, grief, conflict, marital and parenting issues, and unexpected life events.

Gabrielle is married to her high school sweetheart, and she has one daughter and one son. She exercises her creativity through writing, drawing, and poetry. At any given time, she is reading one non-fiction and one fiction book. She also enjoys traveling with her family and going for walks as often as the Iowa weather allows.

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Diana Ortiz, LISW, MSW

Diana Ortiz is a Licensed Independent Master’s of Social Work clinician, with 30 years of clinical experience.  She received her Bachelor of Arts in Social Work from the University of South Dakota, and her Master’s of Social Work from the University of Iowa,  School of Social Work.

She has 30 years of clinical experience, in working with children and adults.  She has extensive expertise in working with issues of domestic violence, divorce, anxiety and depressive disorders, grief and loss, attachment, relationship issues and healing from past trauma, from all abuses.  Diana works with ages 8-65, and has provided individual, family, couple’s and group therapy. 

Diana has a passion for meeting people where they are, and walking with them in their journey to a place of wholeness, healing and improved functioning. 

Diana enjoys spending her time with family and friends, being involved in various groups throughout the community and church, traveling, crafting and cats.

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Stephana Patterson, T-LMHC

Stephana's strongest passion is serving Christ through helping people. Stephana believes strongly in creating a safe space for people to heal and grow, no matter the spiritual, cultural, or religious background. Stephana's gifting is connecting with people and children on an emotional level that encourages and greatly enhances the processes she brings to the healing journey. Stephana empowers her clients to embrace healing and is priviledged to support and walk alongside while healing happens from within the individual.

Stephana's combination of CBT, Family Systems Theory, and Solution Focused Therapy pairs with Dr. McClannahan's guadance in play and art therapy to provide an organic and holistic approach to healing.  Stephana loves working with children and adolescents, helping the littlest ones play through their heartaches, traumas, and hurts. She believes that the role of the caregiver is intimately connected to the child's healing, so it is important to assist the child and parent/caregiver in bonding and growing together.  Stephana completed her masters in counseling at Liberty University.

Stephana has been married for twenty years and has two teenage children. In her spare time, she loves to hang out with her family while going for walks and playing board games. You will most likely find her and her teenage children spending hours upon hours chatting at IHOP over coffee and pancakes!

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Brian Rundle, T-LMFT

Brian Rundle is a Marriage and Family Therapist. He earned a Bachelor of Psychology from the University of Northern Iowa in 2018. He then earned a Masters of Marriage and Family Therapy from Bethel Seminary in 2021. Brian has experience in several different settings within the mental health field which include residential services for teens, intensive outpatient groups for adolescents, and employment services for individuals with mental disabilities. He enjoys working with individuals, families, and couples who are facing the various challenges of life. Some of the common challenges Brian has worked with clients on are anxiety, depression, relationship conflict, marriage conflict, trauma, and coping with unexpected life changes.  


Claire Vander Kooi, LMSW

Claire is a Master Social Worker with a temporary license. She received her Bachelor of Social Work degree and Master of Social Work degree at Dordt University. Prior to joining Heartland, she has served in a school setting and a domestic violence crisis center.  Some of her areas of clinical interest include anxiety, depression, trauma, attachment, identity,  grief and loss, and domestic and sexual violence. Claire primarily sees children and teenagers but also sees adults of various ages. Claire desires to meet people where they are at and walk with them through their hardships. She seeks to create a safe environment to equip people with new skills and tools to promote lasting change. She believes that the Lord is the ultimate comforter, counselor, and healer and she is thankful for that assurance and hope. Outside of work, Claire enjoys spending time with her husband and her two dogs. She enjoys reading and watching movies and can often be found at coffee shops with friends and family. 

West Des Moines Administrative Staff

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Jennifer Faux, Support Staff

Jennifer has been in the medical profession since 2004.  Prior to joining the Heartland Team she worked for 3 years at a community mental health facility.


She assists clinicians with general day to day office tasks and scheduling.

She enjoys doing arts and crafts and game nights with her nieces and nephews.


She also enjoys spending the weekends with her grandchildren.


Mackenzie Peterson, Support Staff

Mackenzie has worked in the mental health field for nine years.  Before joining Heartland, she worked at Pine Rest Christian Mental Health Services providing psychiatry support to their prescribers.  With Heartland, one of her biggest roles is providing support to the clinical staff.  She is also in charge of insurance credentialing, website updates and many other day to day clinic functions.  She enjoys spending time with her husband, daughter and two cats.  She also enjoys crafts, music and playing games.


Chad Quist PA-C, MBA

Chad A. Quist is a Licensed Physician Assistant with over twelve years of clinical experience in the fields of Urgent Care, Occupational Medicine, Psychiatry, and most recently Neurology. He actively works on team integration, communication, and healthy system dynamics. After obtaining his MBA, Chad has incorporated his skills within the fields of healthcare and business by serving numerous organizations and boards. 

As the Director of Operations, he is proud to provide business management support to the Heartland Team. 

Chad enjoys family time with his spouse and three children, church, the outdoors, and college football.

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