Meet Our Diagnostic Experts
Madeleine Gagnon, M.D.
Madeline Gagnon, M.D., is the Medical Director for the Proof Alliance FASD Diagnostic Clinic. She is also the Medical Director of Pediatrics and Complex Care Physician at Gillette Children’s Hospital. Dr. Gagnon is board-certified in pediatrics.
Julia Conkel Ziebell, Ph.D., LP
Dr. Conkel Ziebell is a Licensed Clinical Psychologist with an emphasis in psychological and neuropsychological evaluation of children and adolescents. Areas of interest include assessment of neurodevelopmental disorders, fetal alcohol spectrum disorders, and mood and anxiety disorders.
She received a Ph.D. in Educational Psychology from the University of Minnesota. Dr. Conkel Ziebell completed her doctoral residency in pediatric psychology and neuropsychology at the University of Minnesota Medical School and postdoctoral training at the FASD & Neurodevelopmental Disorders Clinic at Canvas Health. In addition, she holds a clinical certification as an FASD trainer from the Great Lakes FASD Regional Training Center. She has provided extensive training on FASD at the regional and national level.
In her free time, Dr. Conkel Ziebell enjoys running, traveling, and spending time with her husband and two children.
Antoine Jackson, M.A.
Antoine Jackson is the Proof Alliance Psychometrist who conducts neuropsychological evaluations with children and adolescents. He also works as a Mental Health Therapist focusing on child, adolescent, adult and family emotional and behavioral disorders as well as trauma recovery.
Antoine received his Masters degree in Clinical Counseling from Adler Graduate School. He has recently applied for licensure to become a Licensed Professional Clinical Counselor in the State of Minnesota.
Antoine enjoys researching history, road trips, video gaming, family time and working with people in the community.
Mercedes Rider
Mercedes Rider is the Clinic Manager at Proof Alliance. The diagnostic clinic opened in September 2012. She joined the team a month earlier and coordinated the final preparations leading up to that highly anticipated event. Today she is responsible for the daily operations of the clinic.
Mercedes has a BA in Family Studies and an MA in Early Childhood Education, both from San Francisco State University. Mercedes has worked as a service coordinator for families with infants and toddlers having developmental concerns and is fascinated by family systems and structures.
Mercedes also enjoys gardening, reading, and riding her bicycle.
Paige Jablonski, Psy.D., LP
Dr. Jablonski is a Pediatric Clinical Neuropsychologist with several years of experience working with children, adolescents, and their families. Dr. Jablonski’s clinical interests include neurodevelopmental disorders, fetal alcohol spectrum disorders, and brain development in children experiencing complex medical conditions. Her background includes a history of providing psychotherapy, general psychological assessments, and neuropsychological assessments across the lifespan, emphasizing pediatric care in outpatient settings. She also enjoys conducting summative research for educational purposes and has worked in an EEG lab studying attention.
She received both her M.A. in Counseling and Psychological Services and a Psy.D. in Counseling Psychology from St. Mary’s University of Minnesota. She completed her doctoral fellowship in accordance with the principles of the Houston Conference at a Twin Cities outpatient neuropsychological clinic. Dr. Jablonski is also privileged to teach part-time at St. Mary’s University and enjoys teaching about the overlap of neuropsychology and child development in various settings.
Outside of work, Dr. Jablonski can be found in the kitchen, creating a messy but delicious meal for her loved ones. She is a novice video game player and enjoys playing board games, reading, and advocating for her community members and the families she serves.
Betsy Madden, APRN
Betsy is a certified pediatric nurse practitioner with extensive experience working with neurodivergent and underserved populations. She has a background in primary care and neurology and is passionate about educating and supporting her patients. As a provider, her goal is to help patients and their families become the best versions of themselves, recognizing that every journey looks different.
She earned her master’s degree from St. Catherine University and her undergraduate degree from Marquette University. Outside of work, she enjoys keeping up with her two children and husband. Together, they love having dance parties in the living room, spending time outdoors, and cheering on Marquette basketball.
Margaret Matejcek
Margaret Matejcek is the Clinic Care Coordinator and is the point of contact for children and their families from intake through the assessment process for care coordination, referrals, resources and more. Margaret has experience in supporting the treatment of both children and adults living with developmental disabilities, behavioral health disorders, and chronic illness, and holds a special interest in addiction and substance use disorders.
Outside of work, Margaret is a professional opera singer and loves gardening and camping.
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