Human Development Center
Bel Air   Columbia   Ellicott City
Dr. Sandor (Alex) Szollos
Ph: 410-893-3082
We Are
a group of mental health professionals committed to provide the highest quality of psychological services. Our clinical expertise includes the assessment and treatment of problems of childhood (from infancy to adolescence) as well as adult problems (individuals, couples and families). Our services are guided by the best practices and ethical standards of the profession of psychology.


Our staff consists of Licensed Psychologists, Licensed Clinical Professional Counselors and Psychology Associates. The Psychology Associates work under the direct supervision of Licensed Psychologists. We divide our time between clinical work at the Human Development Center and professional positions in academic and clinical settings, which help us to integrate current knowledge with specialized expertise and skills in multiple areas.

Sandor (Alex) Szollos, Ph.D.
Licensed Psychologist
Dr. Szollos received his initial psychology training at Lund University in Sweden; thereafter worked for several years as Staff Psychologist at the Lund University Medical School, treating adults and children with serious psychiatric disorders. He received his doctorate in Clinical Psychology from the University of Connecticut and completed his internship at the Brown University Medical School, specializing in child and adolescent disorders. Dr. Szollos has been a clinician since 1976; following several years of private practice in the Baltimore area, he established his practice in Bel Air in 1989. He works with children, teens, adults and families in psychotherapy. His clinical expertise includes problems of early childhood, ADHD, Autism Spectrum Disorders, parenting problems of children and teens, marital problems, anxiety, depression and mood disorders. Before his retirement after 30 years of teaching in 2011, Dr. Szollos was a faculty member at the Department of Psychology, Millersville University of PA, teaching and training graduate students. He is a Member of the Association for Psychological Science, the Association for Behavior and Cognitive Therapy and a Fellow of the Maryland Psychological Association.

Mary D. Hill, Ph.D.
Licensed Psychologist
Dr. Hill received her Master’s Degree in Community Counseling from the University of Maryland at College Park and her Ph.D. in Clinical Psychology, with a minor in Neuropsychology, from Howard University. She completed her Internship at Spring Grove Hospital, treating chronically mentally ill adults, completing neuropsychological evaluations and treating children and adolescents at an Outpatient Mental Health Center. A former high school Biology teacher, Dr. Hill also taught graduate courses in Counseling at Trinity University in Washington, D.C. Dr. Hill divides her time between serving the Bel Air community and her private practice in Ellicott City. Her areas of expertise include clients with chronic mental illness, mood disorders, anxiety, ADHD, OCD, teen-parent developmental issues, Asperger’s Disorder, dissociative disorders, PTSD and helping people grow and adjust to life’s transitions. She is the Member of the American Psychological Association, a Fellow of the Maryland Psychological Association and a Member of the Baltimore Society of Psychoanalytic Studies.

Hope Odenwalt, M.S.
Psychology Associate
Ms. Odenwalt holds a Master of Science Degree in Clinical Psychology from Millersville University of PA. Prior to joining our practice in 2005, she worked in mental health emergency services for several years and developed special expertise in suicide and homicide risk assessments. She works with children, teens, and adults. Her areas of expertise include the assessment and treatment of Asperger’s Disorder, psychological testing, child and teen disorders, anxiety and mood disorders, women’s issues, crisis intervention and addiction treatment. She has also special expertise in developing and directing social skills training programs for children and teens with Asperger’s Disorder. Ms. Odenwalt divides her time between her work at our Clinic and teaching as Adjunct Faculty in the Psychology Department at Millersville University. She is a member of the Eastern Psychological Association, the Pennsylvania Psychological Association, and the Pennsylvania Women’s Consortium.

Lori Gallup, Psy.D.
Psychology Associate
Dr. Gallup received her doctorate in Clinical Psychology from the American School of Professional Psychology, Arlington, VA. She completed her internship at Ancora State Hospital in New Jersey, where she treated chronically mentally ill adults and completed neuropsychological evaluations for forensic as well as neurological/rehabilitative purposes. She also completed externships at Children’s National Medical Center in Washington, D.C. and at Mount Washington Pediatric Hospital (Baltimore, MD), focusing on neurodevelopmental disorders, including learning disabilities, ADHD, and autism spectrum disorders. Dr. Gallup is also a highly experienced School Psychologist; she has dual Master’s degrees in Reading and Special Education, as well as a Certificate of Advanced Graduate Studies in School Psychology. As a School Psychologist she worked in both urban and rural settings, worked with juvenile delinquents and their families and supervised other school psychologists in forensic settings. Dr. Gallup also has special expertise in identifying unique learning strategies in academic settings. Dr. Gallup divides her time between her work at our Clinic and providing school psychological services for youth and their families with the Baltimore County Public School System.

Aaron Wheeler, Psy.D.
Psychology Associate
Dr. Wheeler received his doctorate in Clinical Psychology from the Institute for Graduate Clinical Psychology at Widener University in Chester, PA. He completed concentrations in School Psychology and Neuropsychology. Dr. Wheeler’s training experiences including working in private practice settings, school settings, out-patient clinics and in-patient psychiatric settings. He has worked with children, adolescents and adults with a wide range of presenting concerns including Autism Spectrum Disorders, anxiety, depression, learning disabilities, ADHD, executive dysfunction, and disruptive behavior disorders. Dr. Wheeler also works as a School Psychologist with Baltimore County Public Schools, serving as a Dyslexia Resource Psychologist and supporting students with severe emotional and behavioral disabilities. He is an adjunct professor at the University of Pennsylvania’s Graduate School of Education’s Executive Master’s in School & Mental Health Counseling. Dr. Wheeler believes in a humanistic, client-centered approach to psychotherapy with an emphasis on Cognitive Behavioral techniques and evidence-based practice.

Robert Bentzley, M.S., LCSW-C
Psychology Associate
Mr. Bentzley held a Master of Science Degree in Clinical Psychology from Millersville University of PA, as well as a Master of Social Work Degree from the University of Maryland. He worked in a variety of mental health settings including hospitals, outpatient clinics and school-based counseling programs. His areas of expertise included family therapy, group therapy, parent training, treatment of children and teens with serious behavioral disorders, and psychological assessments. He developed and directed social skills programs for children with ADHD and Asperger’s Disorder. He also presented numerous workshops to parents and professionals on a variety of topics. He started clinical practice in 1994, and divided his time between his work at our Clinic and as a school social worker with the Baltimore County Public School System between 1996 and 2011. Rob was known by all as a kind, gentle and compassionate man with a keen sense of humor and a love of people that served him well in his chosen profession. He passed away after a long and valiant struggle with a very serious illness in 2013. R.I.P.

  Copyright © 2021 Human Development Center. All rights reserved.