Psychology Internship Faculty
Brant VanOrman, PsyD, is the Training Director for the pre-doctoral psychology internship at Pine Rest. He graduated from Wheaton College after completing his internship with Pine Rest. He then conducted assessment and therapy at the Grand Haven clinic for two years before transferring in 2002 to the Psychological Consultation Center on Pine Rest’s main campus. He is an Adjunct Assistant Professor at Michigan State University’s College of Human Medicine. His current outpatient work is largely related to psychological assessment and consultation. He was named Training Director for the internship beginning in 2007. He facilitates the integration of faith, science and practice through the Case Conference Seminar. He supervises the Child and Adolescent inpatient rotation.
Sera Gruszka, PhD, is the Assistant Training Director for the pre-doctoral psychology internship at Pine Rest. She graduated from Ball State University in 2011 after completing her internship with Pine Rest. Her post-doctoral work included outpatient therapy in a traditional mental health setting and in a primary care setting. Additionally, she completed one year of a post-doctoral fellowship in neuropsychology. She currently works at the Campus Clinic on Pine Rest’s main campus and provides outpatient therapy to individuals, couples, and families. Her areas of clinical interest include anxiety disorders, OCD, chronic pain, older adult concerns, and marital and family issues. She is a supervisor for Pine Rest’s Psychiatry Residency Program. She was named Assistant Training Director for the internship beginning in 2014. She also supervises the Caring Communities rotation. Dr. Gruszka is an Adjunct Assistant Professor at Michigan State University’s College of Human Medicine.
Elizabeth Cyr, PsyD, is an adjunct supervisor for the Pine Rest Northwest Clinic. Dr. Cyr graduated from the Illinois School of Professional Psychology, Chicago in 2011. She has worked for Pine Rest since entering as a pre-doctoral psychology intern in 2010. She currently serves as the Outpatient Coordinator for the perinatal mood and anxiety disorders team (PMAD). A generalist in practice, Dr. Cyr enjoys serving adolescents and adults with a wide range of presentations. She has particular interest working with individuals experiencing grief, trauma, personality concerns, or PMAD.
Mark DeVries, PhD, is a licensed psychologist who has provided psychological and neuropsychological assessment services since 1992 in a number of settings in Grand Rapids including the psychiatric medical unit, Pine Rest’s Psychological Consultation Center, Pine Rest’s inpatient and outpatient programs, and Hope Network Rehabilitation Services. He supervises the neuropsychological assessment rotation. He completed a PhD in clinical psychology at Fuller Theological Seminary’s Graduate School of Psychology in 1992. He is a member of the National Academy of Neuropsychology (NAN). He currently provides a number of assessment services for adults and older adults, including dementia assessments, ADHD assessments, and clinical psychology assessments.
Scott Halstead, PhD, is a supervisor for the Van Andel inpatient rotation and neuropsychological testing. Dr. Halstead received his degree from Fuller Theological Seminary in 1992, served as a psychologist with the U.S. Air Force from 1991 to 2003, and completed a two-year neuropsychology fellowship at Brown University in 2000. Joining Pine Rest in 2003, he is the Corporate Director of Pine Rest’s Professional Practice Group. He also provides outpatient and inpatient neuropsychological evaluations. Dr. Halstead specializes in working with older adults with memory disorders, and presents to interns on this and other assessment issues.
Lesley Hetterscheidt, PhD, is a fully licensed practicing psychologist and the manager of Pine Rest’s Northwest Clinic. She attended the University of Michigan for her undergraduate education and then received her masters and doctorate from Wayne State University. She completed her post-doctoral internship with Pine Rest, and continued on at the Northwest Clinic specializing in adult ADHD, couples issues, anxiety disorders, perinatal mood disorders and women’s issues. Her outpatient work includes therapy with adults, teens and families addressing a variety of mental health issues and supervision of both masters level clinicians and post-doctoral interns.
Ryan Jaarsma, PsyD, graduated with his doctorate from Wheaton College in 1998 after completing his internship at the Western Michigan University Counseling and Testing Center. He began working at Pine Rest in 1998 and became an outpatient supervisor in 2001. He provides psychotherapy to individuals and couples at the Pine Rest Campus Clinic and facilitates the psychotherapy training for Pine Rest’s Psychiatry Residency program.
Gregory Mallis, PsyD, is the supervisor for the Christian Counseling Center outpatient therapy rotation. Dr. Mallis received his undergraduate degree from the University of California, San Diego, and his doctoral degree from the University of Indianapolis in 2012. He has worked at the Christian Counseling Center since 2013. Dr. Mallis has previously worked in settings that include university counseling centers, completing his internship at Purdue University Counseling and Psychological Services. Dr. Mallis’s current clinical areas of interest include working with young adults and adults with anxiety disorders, mood disorders, identity and phase of life issues, relationship issues and couples counseling, compulsive sexual behaviors, men’s issues, and sexuality concerns.
Daniel Post, PsyD, is a licensed psychologist who has practiced at Pine Rest Christian Mental Health Services since 2010. He is the lead forensic psychologist within the Psychological Consultation Center at Pine Rest. Dr. Post completed his undergraduate degree at Calvin College and doctoral degree at Wheaton College. His work experience includes inpatient, outpatient, and forensic assessment and treatment across a diverse population. He provides pre- and post-doctoral psychological supervision and is in charge of the residential testing rotation. Dr. Post has been an adjunct instructor with Michigan State University since 2016, providing forensic lectures and supervision to second and third year psychiatric residents. Dr. Post’s current clinical areas of interest include specialty assessment services, supervision, and the treatment of anxiety, mood, and behavioral disorders in children and adults. Dr. Post is a member of the American Psychological Association.
Bruce Retterath, PhD, is a licensed psychologist who has practiced at Pine Rest Christian Mental Health Services since 1993. He is the manager of the Psychological Consultation Center at Pine Rest. Dr. Retterath completed his undergraduate and doctoral degree at the University of North Dakota. His prior work experience includes inpatient, outpatient and residential settings. Dr. Retterath’s current clinical areas of interest include the assessment and treatment of ADHD, anxiety disorders and mood disorders, diagnostic/personality evaluations, pre-surgical evaluations, learning disability evaluations, and management consultations. Dr. Retterath is a member of the Anxiety Disorders Association of American, American Association of Christian Counselors, and Michigan Psychological Association.
Pamela White, PhD, is a fully licensed psychologist who has practiced at Pine Rest since 1994. She completed her undergraduate degree at Miami University and earned her doctorate in clinical psychology at Kent State University in 1987. She completed her internship at Ohio State University Hospitals and her post doctoral fellowship at a behavioral medicine/rehabilitation center affiliated with OSU hospitals. Prior to joining Pine Rest, Dr. White provided outpatient therapy and consultation at Children’s Hospital of Columbus, Ohio. She currently provides outpatient therapy and consultation to children, adolescents, and adults at Pine Rest’s Campus Clinic, where she serves as supervisor.
Timothy Zwart, Ed.D., is an at large member of the Training Committee, and has served as a clinical supervisor and Assistant Training Director in the past. Dr. Zwart graduated from Western Michigan University in 1988. At Pine Rest, he administers the ADD Institute and provides a broad variety of diagnostic assessments, including ADHD, ASD, and general diagnostic evaluations; personality assessment; pre-surgical (bariatric) assessment; and conducts assessment for Catholic seminary candidates. He is member of the Michigan Psychological Association and American Association of Christian Counseling.
Mark Eastburg, PhD: President / Chief Executive Officer
Alan Armstrong, MD: Vice President/Chief Medical Officer
Bob Nykamp: Vice President / Chief Operating Officer
Scott Halstead, PhD: Corporate Director, Professional Practice Group
Harmony Gould: Corporate Director, Hospital Based Services
Al Jansen: Director, Residential Services
Gary Burkhart: Chair of Psychology Department