Dr. Roxanne Dryden-Edwards has more than 30 years of healthcare experience.  

 Dr. Roxanne Edwards is an adult, child & adolescent psychiatrist.  She is a former chair of the Committee on Developmental Disabilities for the American Psychiatric Association, Assistant Professor of Psychiatry at Johns Hopkins Hospital, and Senior Psychiatrist at the Kennedy Krieger High School, in Baltimore, MD.Dr. Edwards served as the Medical Director of the National Center for Children and Families in Bethesda, MD., where she helped establish a quality assurance program.  

Dr. Edwards is co-editor and chapter contributor "Developmental Disabilities from Childhood to Adult: What Works in Community Settings", published by Johns Hopkins University Press.  She is also a contributing author to WebMD providing consultations on topics such as managing grief, drug abuse and Separation Anxiety Disorder.

Dr. Edwards received her undergraduate and medical degrees at Howard University.  She completed a residency in General Psychiatry at Sheppard and Enoch Pratt Hospital in Towson, MD. as well as a residency in Child and Adolescent Psychiatry at Children's National Medical Center in Washington, D.C. where she was Associate Chief Resident.  Dr. Edwards is board certified in General Psychiatry.

Office Hours: Monday and Tuesday 8:30 a.m. - 2:30 p.m. Thurs and Fri 8:30 a.m. - 5:00 p.m

Ext: 205

Maureen B. Chamberlin, M.D.

Dr. Chamberlin received her Doctor of Medicine from the State University of New York Health Science Center at Syracuse and completed her residency training at Duke University Medical Center in North Carolina.  She is Board Certified by the American Board of Psychiatry and Neurology and has extensive experience in psychopharmacology.  Dr. Chamberlin provides diagnostic assessment and medication management for adults.  She has been with the practice since January, 2005

Office Hours: Monday, Tuesday and Thursdays, 8:45 a.m. - 4:30 p.m. Ext: 206

lhuoma Nicole Okezie, M.D.

Dr. Okezie earned her Doctor of Medicine at the University of Tennessee Health Science Center in Memphis, TN.  She completed her residency at the University of Texas Health Science Center in Houston, TX.  Dr. Okezie completed her Child and Adolescent Fellowship at the University of Illinois in Chicago.  She is board certified in Psychiatry  and is currently pursuing her board certification in Child and Adolescent Psychiatry. Dr. Okezie provides diagnostic assessment and medication management for adults and children. Dr. Okezie has been with the practice since September, 2011.

Office Hours: Monday and Wednesday 9:00 a.m. - 5:00 p.m. and the third Friday of the month 9:00 a.m. - 2:30 p.m. Ext: 304

H. Brian Berthiaume, LCSW-C

​Mr. Berthiaume earned his Masters' in Clinical Social Work from the University of Maryland, Baltimore and his Master of Arts in Special Education from Trinity Washington University in Washington, D.C.  He established and ran three small high schools in Montgomery County, MD for students with emotional and drug/alcohol problems.  The Association of Recovery Schools has presented to Mr. Berthiaume the Jim Czarniecki Visionary Award for establishing the first recovery high school in the nation in 1979 and for his "outstanding contributions to the field of recovery schools. Mr. Berthiaume provides cognitive behavioral therapy for adolescents, adults and couples.  Mr. Berthiaume has been with the practice since March of 2004.

Ext: 305​​

Mary E. Rouse, APRN, BC

Ms. Rouse received her Master of Science in Nursing from the University of Maryland and is board certified as a Clinical Nurse Specialist in Adult Psychiatric and Mental Health Nursing.  She has extensive experience treating anxiety, depression, and bipolar disorders as well as trauma and grief.  Ms. Rouse is trained in the uses of EMDR for relief of trauma symptoms.  She also works with eating disorders and weight management utilizing a bio-psycho-social approach.  Ms Rouse, a military veteran, is familiar with the challenges faced by veterans and their families.  She is also experienced in treating those with chronic pain.  Ms. Rouse has been with the practice since 1986.

Ext: 306

Elizabeth Stellhorn, LCSW-C

Ms. Stellhorn earned her Master's degree in Social Work from the University of Maryland and has been in practice for 24 years.  She works with adults with mood and thought disorders, as well as marital difficulties.  Ms. Stellhorn has also worked extensively with the elderly in outpatient settings, as well as nursing homes and assisted living facilities.  Ms. Stellhorn has been with the practice since November, 2009.

Ext: 309

Cynthia Young, Psy.D.

Dr. Young earned her Bachelor of Arts Degree from Brown University graduating Magna Cum Laude with a membership in Phi Beta Kappa Society.  She went on to earn her Doctor of Clinical Psychology at the University of Illinois.  Dr. Young provides psychotherapy for adults and specializes in issues surrounding depression and relationships.  

She has been with the practice since June, 1997.

Ext: 209

Charlene Morgan, PA - C

​Charlene Morgan is a Board Certified Physician Assistant.  She received her Bachelor of Science from Georgetown University and her Master of Science from Central Michigan University.   She specializes assessment of adults, adolescents and children and provides medication management services.  Ms. Morgan joined the practice in March, 2015. 

Office Hours: Thursday 10:00 a.m. - 5:00 p.m. Ext: 308


Marci Fenton, LCSW - C

​Marci Fenton received her Master of Social Work from The University of Maryland, Baltimore County. She has over 20 years experience providing psychotherapy services to individuals, couples and families.  Ms. Fenton specializes in couples’ therapy, supportive therapy for parents of special needs children, and adolescents.  She was a therapist with our practice until 2002 and has rejoined the practice in August, 2016.

​Ext: 310

Tanya Hernandez, Psy.D

Dr. Hernandez earned her Masters Degree in counseling psychology from Towson State University and Doctorate in Clinical Psychology from Argosy University, The American School of Professional Psychology.   Dr. Hernandez provides psychotherapy services to adults, adolescents and children with depression, anxiety , ADD, ADHD, behavioral disorders and learning disabilities.  Her office hours are Wednesdays 8:30 to 2:30 p.m.  She has been with the practice since October, 2018.  Ext. 207

Xiujun Zhao, M.D. , M.D.

​​Dr. Zhao earned his Doctor of Medicine from Huabei Medical College in Tangshan, China.  He completed his residency from the University of North Dakota and is board certified in Psychiatry.  Dr. Zhao provides diagnostic assessment and medication management services to adults.  His office hours are on Fridays, 8:30  a.m. to 5:30 p.m. He joined our practice in January 2020.    Ext. 300



​​Dryden-Edwards Psychiatric Services


  • Psychotherapy
  • Depression
  • Anxiety Disorders
  • Counseling
  • Medical Illness
  • Marital Therapy
  • Parenting Support
  • Women's Issues