Comprehensive Assessment
and Treatment For All Ages

Ambers Professional Center
170 Thomas Johnson Drive
Suite 200
Frederick, MD 21702



We have professionals from several disciplines on staff to meet your needs.

Meet Our Providers


Shin-Bey Chang, MD

Shin-Bey Chang, MD is board certified in General Psychiatry and Child and Adolescent Psychiatry. Dr. Chang is a native New Yorker who completed her undergraduate studies at the University of Pennsylvania and attended medical school at Drexel University College of Medicine in Philadelphia, PA. She completed both her adult psychiatry residency program and child and adolescent psychiatry fellowship at the Johns Hopkins Hospital in Baltimore, MD where she also served as chief resident. Prior to joining Blue Ridge Behavioral Health in 2020, Dr. Chang was the director of an outpatient mental health clinic for children and adolescents as well as a partial hospitalization program that treated acutely and severely ill children in a community hospital in Baltimore, MD for over 5 years.

Dr. Chang provides treatment, evaluation, and consultation services for children, adolescents, and adults. She has a wide range of clinical interests which include neurodevelopmental disorders such as ADHD and Autism Spectrum Disorder, disruptive behavior disorders, mood and anxiety disorders, trauma, psychosis, and community psychiatry.

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Zeb Khan, MD

Zeb Khan, MD is Board Certified in General Psychiatry and Child and Adolescent Psychiatry. He completed a four year rotational training program in General Psychiatry at the University of Manchester in England, United Kingdom. Dr. Khan also completed an additional two years of training in Adult Psychiatry at the University Hospitals of Case Western Reserve University in Cleveland Ohio. He completed his training in Child and Adolescent Psychiatry at the Massachusetts General Hospital in Boston. From 1989 to 1992 he served as a clinical fellow in the department of Psychiatry at Harvard Medical School.

Dr. Khan has been in private practice since 1991 and joined Blue Ridge Behavioral Health Services in 2000. He provides psychiatric services primarily to children and adolescents but devotes a small amount of time seeing adults as well. His areas of interest are depression, anxiety and bipolar disorder in children and young adolescent. He treats a wide variety of psychiatric disorders in his practice and has extensive experience in long term work with severely emotionally disturbed children and adolescents. He has been a consultant at the Jefferson Residential School in Frederick Maryland since 1999.

Dr Khan is a past member of British Medical Association and General Medical Council in London. Presently he is a member of American Academy of Child and Adolescent Psychiatry and American Medical Association. He is also affiliated with Sheppard Pratt Hospital in Baltimore, Maryland.

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Grace Thammasuvimol, MD

Grace Thammasuvimol, M.D. is board certified in General Psychiatry and Child and Adolescent Psychiatry and provides consultation, evaluation, and ongoing treatment to children, adolescents, and adults. She graduated from the University of Maryland at College Park and Drexel University College of Medicine in Philadelphia, PA. She completed her medical training with residency in general adult psychiatry and then fellowship in child and adolescent psychiatry at the Johns Hopkins Hospital in Baltimore, MD and also served as chief resident.

Dr. Thammasuvimol joined Blue Ridge Behavioral Health in 2014 and her clinical interests include psychopharmacology, transitional age youth, women’s mental health, and the treatment of mood and anxiety disorders, OCD, ADHD, disruptive behavior disorders, psychosis, and autism spectrum disorder.

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Cynthia Keysor, Ph.D.

Dr. Keysor works with individuals ranging from toddler-age through adulthood, in collaboration with parents and families when indicated. She has extensive experience in treating disorders of behavior, mood, anxiety, and adjustment. Examples of concerns addressed in treatment include those related to attention-deficit, hyperactivity disorder, oppositional/defiant behavior, tantrums aggression, anger management, depression, low self-esteem, social skill deficits, grief and loss, adjustment to separation and divorce, obsessive-compulsive behaviors, separation anxiety, worrying/stress, parenting practices, and parent-child relationships. Dr. Keysor also works with children and adolescents with developmental disabilities, including those with genetic disorders, and high functioning autism. She is a collaborative member of the multi-disciplinary Developmental Team at Blue Ridge Behavioral Health.

Dr. Keysor graduated from Georgetown University with a Bachelor of Science degree in Psychology in 1985. She later pursued her graduate studies at the University of North Carolina at Greensboro, earning both her Master’s and Doctorate degrees in Clinical Psychology. Prior to joining Blue Ridge Behavioral Health in 2006, Dr. Keysor was on the faculty at the Johns Hopkins University School of Medicine, Division of Child and Adolescent Psychiatry, and at the Kennedy Krieger Institute, where she was a practicing psychologist and Clinic Director of Outpatient Psychiatry.

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Thomas Pollack, Psy.D.

Thomas Pollack, Psy.D. has been a practicing therapist since 1979. He works with adults, families and couples. Dr. Pollack assists people who are experiencing excessive anxiety or disruptive depression. His specialties include the cognitive treatment of anxiety and depression as well as cognitive / interpersonal approaches to treating couples.

Dr. Pollack received his Bachelor of Arts Degree from the University of Maryland, Baltimore County in 1973 and his Master's Degree in Developmental Clinical Psychology from Antioch University in 1978. He received a Doctorate in Psychology from the Virginia Consortium for Professional Psychology in 1990.

Additional specialized training include the following One-Year Training Programs: “The Anxiety Disorders: A Clinical Consultation Group for Licensed Professionals”; “Couples Therapy Post-Doctoral Institute”; and “Intensive Training Program in Emotionally Focused Therapy for Couples”.

In 1987, Dr. Pollack established the Partial Hospital Program of Portsmouth Psychiatric Center and served as the Clinical Director until 1989. He then became the Clinical Director of Inpatient Adult Services until 1990. Dr. Pollack is a past Board Member of both the Frederick County Mental Association and Heartly House. He served as the Legislative Chairperson for the Maryland Psychological Association from 2003 to 2006.

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Christie Tanner, Ph.D.

Christie Tanner, Ph.D. works with children, adolescents, adults, and families. She uses a collaborative, co-therapist approach to helping parents understand and respond to their children’s individual needs. Dr. Tanner specializes in disorders of behavior, mood, and adjustment within a wide range of presenting concerns. She has extensive experience working with the following areas of need: social anxiety and shyness, separation anxiety, social skill weaknesses, obsessive compulsive behaviors, depression, low self- esteem, hyperactivity, tantrums, noncompliance, aggression, attention issues, executive functioning deficits, parent-child relationship struggles, and parenting concerns. In addition, Dr. Tanner works with individuals across the life span with developmental disabilities, specializing in Autism Spectrum Disorders.

Dr. Tanner graduated from West Virginia University with a Bachelor of Arts degree in psychology. She received a Doctorate degree in Clinical Psychology from the State University of New York in Albany with an emphasis on cognitive-behavioral and empirically validated therapeutic approaches. Dr. Tanner completed her Clinical Internship and Post-Doctoral Fellowships at the University of North Carolina at Chapel Hill where she received extensive training in pediatric psychology and developmental disabilities.

After the completion of her training programs, Dr. Tanner served as clinical faculty at the UNC-Chapel Hill TEACCH Program with a wide-range of clinical and research responsibilities including a therapeutic program for toddlers with autism, consultation to the children’s inpatient psychiatric unit, and services for adults with autism. Prior to joining Blue Ridge Behavioral Health Services in 2005, Dr. Tanner worked with children, adults, and families within a hospital-based out-patient psychiatric practice and provided clinical services in collaboration with a pediatric office for underserved children and families in rural Virginia.

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Jennifer Atwell, LCSW-C

Jennifer (Jenn) Atwell is a Clinical Social Worker. She has experience working with children, adolescents, and adults. She has provided therapy for management of anxiety, depression, ADHD, and emotional dysregulation related to changes in one’s life situation. She practices from the framework of Cognitive Behavioral Therapy (CBT) and views problems from a systems perspective. She emphasizes clients’ strengths and supports clients in developing and utilizing healthy coping skills and a natural support network.

Jenn received her Bachelor’s Degree in Psychology from the University of North Carolina, Asheville in 2003 and her Master’s in Social Work specializing in Mental Health from the University of Maryland, Baltimore in 2009. She provided therapy at Villa Maria Behavioral Health Clinic for nearly six years. Her position with Villa Maria allowed her to become knowledgeable of the resources for at-risk families in the Frederick County area. In addition, her previous experience afforded her the opportunity to work collaboratively with Frederick County Public School staff and improve her skills in working with a treatment team of providers.

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Casey Blaser, LCSW-C

Casey Blaser, LCSW-C has been working with children, adolescents and adults since 1979. She received her Master’s Degree from the University of Maryland School of Social Work. Her post graduate training and experience includes being trained in and using EMDR extensively with children, adolescents and adults. She specializes in treating Trauma and family conflict.

Casey provides individual and family therapy services specializing in relationships, attachment, self-harm, anxiety issues, Oppositional Defiant Disorder and Conduct Disorder. Her experience includes working at Frederick County Department of Social Services, Boys and Girls Homes of Montgomery County, Heartly House, Associated Family Counseling, Brooklane, and The Jefferson School.

She is a board-approved supervisor for LGPCs and LGSWs. She is trained in Dialectical Behavior Therapy and a past trainer of RAP (Response Ability Pathways / Circle of Courage) and NMT (Neurosequential Model of Therapeutics).

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Mary Beth Curry, LCPC ACC

Mary Beth Curry is a licensed clinical professional counselor (LCPC) practicing since 2003. Her specialty areas include: eating disorders, recovery from alcohol and drug addiction, and personality disorders. She uses cognitive and dialectical behavioral therapies (CBT & DBT) while providing therapeutic support to adolescents, adults, couples and families. Mary Beth is on the Eating Disorder Program at Blue Ridge Behavior Health.

Mary Beth’s has experience working with a variety of populations and in a range settings. She provided treatment of severe psychosis in an adult day treatment program and individual and group therapy in a methadone treatment center. She also worked in several university counseling centers, providing treatment of eating disorders, attachment and adjustment disorders, and depression. While at the University of Vermont (UVM), she was the chair of the multidisciplinary eating disorder treatment team: Help Overcome Problem Eating (HOPE) which was comprised of a medical doctor, psychiatrist, nutritionist, athletic trainer and counselors.

She earned a BA in psychology from West Virginia University (1990), a MS in Counseling Psychology from Northeastern University (2003) and is currently in dissertation phase towards a doctorate in educational leadership at University of Pennsylvania.

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William Derbyshire, MSSA, LCSW-C

Bill Derbyshire has been practicing clinical social work since 1977. He received his B.A. from The College of Wooster (1975) and MSSA from Case Western Reserve University (1977) in Cleveland, Ohio. Bill received further training at the Family Therapy Practice Center in Washington D.C. In addition to his clinical work Bill works as a school social worker at Rock Creek School and as an adjunct faculty member at Hood College.

Areas of experience as a therapist include family relationships, couples, and individual therapy, working in the framework of competency based and cognitive therapies. Bill works with people who experience difficulties in the areas of parent-child relationships, anxiety, depression, and couples conflict. Bill also provides clinical services for persons with Autism Spectrum Disorder and their families.

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Kevin Graditor, LCSW-C

Kevin Graditor, LCSW-C, provides therapy to children, adolescents, young adults and their families. Kevin specializes in treating Disruptive Behavior Disorders (ADHD, Oppositional Defiant Disorder & Conduct Disorder), Mood Disorders (Depression & Bipolar) and Anxiety Spectrum Disorders.

He also works with difficulties surfacing from various life transitions and treats individuals suffering from insomnia. Kevin works within the therapeutic framework of Cognitive Behavioral Therapy (CBT) and the Family Systems treatment model.

Kevin received his Bachelor’s degree in 1997 from Goucher College and his Master’s degree from the University of Chicago in 2003. He received his advanced clinical degree in 2007. Kevin has extensive experience working within the Frederick County Public Schools at the elementary, middle, and high school levels, where he has presented to teachers and other faculty members on various topics such as behavior management within the classroom and deescalating the angry student. Kevin has been in private practice for over six years, and provides therapy in both English and Spanish.

Mr. Graditor recommends these links:

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David Hudak, LCSW-C

David Hudak is a clinical social worker and graduate of the University of Maryland School of Social Work. He has over 35 years of experience evaluating and treating children, adolescents, young adults, and families.

David has maintained a special interest in evaluation and treatment of Attention Deficit and Hyperactivity Disorder (ADHD). David works with the most common disorders: Depression, Anxiety, OCD, Autism, and Bipolar Disorder. Additionally, he works with young adults in transition with issues around relationships, college, work, and life goals.

Treatment modalities include, psychotherapy, skills training, cognitive behavioral therapy, family therapy, couples therapy, parenting guidance, and ADHD coaching: improving impulse control, organization and time management, and task follow-through.

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Jennifer Howell, LCSW-C

Jennifer Howell is a Clinical Social Worker who works with children, adolescents, adults, and families. Her clinical interests include evaluation and treatment of Anxiety, Depression, Attention-Deficit/Hyperactivity Disorder (ADHD), Trauma, Grief, Behavioral Disorders, and Adjustment Disorders. In her work with clients, Jennifer uses Cognitive Behavioral Therapy (CBT), Dialectical Behavioral Therapy (DBT), Behavioral Therapy, and Play Therapy. She aims to draw out her client’s strengths and to support their development of new, healthy coping skills. Self-control, frustration tolerance, anger management, mindfulness, time management, organizational skills, and emotion regulation are examples of skills she helps her clients develop.

Jennifer completed her undergraduate studies at High Point University in North Carolina in 2010. She then completed her Master’s Degree in Social Work from Radford University in Virginia in 2014, and more recently has earned her advanced clinical license (LCSW-C).

Prior to joining Blue Ridge Behavioral Health in 2020, Jennifer worked at a community hospital in West Baltimore where she was a therapist in the Outpatient Program and in the Partial Hospitalization Program (PHP). Earlier experience included working as a school-based therapist in a high school in rural, Virginia, and providing in-home therapy services in West Virginia. Jennifer is excited to now be working with clients in the Frederick area.

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Elizabeth Landry, LCSW-C

Elizabeth Landry, LCSW-C has been a practicing therapist since 1993. She works with middle school aged children, adolescents, families and adults. Elizabeth has extensive experience in the treatment of adolescents with mood and anxiety disorders. She has worked extensively with adolescent girls struggling with disruptive life circumstances (divorce/trauma), self-injurious behavior, school difficulties and eating disorders. In addition to her work with adolescents she is a trained Family Therapy specialist and has additional expertise in grief counseling.

Elizabeth received her Bachelor of Science Degree from the University of Maryland, College Park (1991) and her Master’s Degree in Clinical Social Work from the University of Maryland at Baltimore (1993). She received her advanced clinical license (LCSW-C) in 1995 and completed post-graduate studies in family therapy from the Family Therapy Practice Center, Washington, DC, (1998) where she also served as a faculty member from 1998 to 2001. Elizabeth has taught as a Field Supervisor for the University of Maryland School of Social Work and has provided various training and in-service seminars for the Frederick County Public School system and Hood College. She also has extensive experience in the coordination of care with various legal, educational and medical service systems in the Frederick County area.

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Elizabeth Pollack, LCSW-C

Elizabeth (Lisa) Pollack, LCSW-C has been a professional therapist for over 35 years, with experience in both inpatient and outpatient settings. She was a therapist on multidisciplinary treatment teams at Taylor Manor Hospital and Psychiatric Institute of Montgomery County. She was the Clinical Supervisor at Navy Family Service Center, both at Little Creek and Oceana Naval Stations in Virginia. She began practicing in Frederick in 1990, co-managing the Frederick Employee Assistance Program. There she provided clinical services to employees as well as supervisory training to businesses in the Frederick area.

Lisa joined Blue Ridge in 1998, working with adults in both individual and couples therapy. Lisa has extensive experience in helping those who are experiencing relationship problems, mood and anxiety disorders and loss or adjustment issues.

Lisa earned her Master’s Degree in Clinical Social Work from the University of Maryland at Baltimore in 1982. She received post-graduate training in family therapy at Philadelphia School of Child Guidance. She has advanced training in cognitive behavioral therapy and certification from the National Board of Cognitive Behavioral Therapists.

Lisa has extensive training and special interest in couples therapy. Her training includes the Couples Therapy Institute offered by the Maryland Psychological Association and an intensive training program in Emotionally Focused Couples Therapy.

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