Columbia Office

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Meet Our Team:

Anthony Massey, MD

Dr. Anthony Massey grew up in New Orleans, Louisiana. He earned a BA and MBA at Johns Hopkins, and an MD from the Louisiana State University School of Medicine in New Orleans. He completed his internship in the US Navy and residency in psychiatry at Sheppard Pratt Hospital. He is board-certified in both psychiatry and addiction medicine.

Dr. Massey is a retired from the US Navy, having served as a physician in East Asia during Operation Desert Shield and during the Iraq War as an addiction medicine psychiatrist. Also, he was on faculty at the University of Maryland School of Medicine in the departments of psychiatry, internal medicine and family medicine. Dr. Massey has worked with adolescent and adult patients in hospital and in outpatient settings. Particular areas of focus have been mood and anxiety disorders, attention deficit disorders, addiction, and integrated health and wellness.

Anthony Massey

Patricia Dunn, MS, NCC, LCPC, Chief Clinical Officer

Patricia Dunn is a Licensed Clinical Professional Counselor in the state of Maryland and a National Certified Counselor. Patricia received her Bachelor of Science degree in Psychology with minors in Sociology and Business, and a focus on Developmental Research, from Virginia Polytechnic Institute and State University. Patricia received her Master of Science degree in Mental Health Counseling Therapy from McDaniel College, where she specialized in Child and Adolescent Psychology, Stress and Anxiety Management, Substance Abuse and Addictions, and Positive Psychology. Patricia has worked in the hospital, in-home and private settings; providing mental and behavioral health care to children, adolescents, adults, families and couples. Patricia has experience working with intellectual and developmental disabilities, as well as court-ordered treatment programs. Most recently, Patricia provided in-home and in-school therapy to Baltimore City and Baltimore County residents and their families. Patricia provides a collaborative, interactive and person-centered approach to therapy for children, adolescents, adults, couples and families. Patricia’s focus at Gladstone is working with children, adolescents and young adults, as well as their families, to help them improve their overall quality of life and work toward a brighter future. In addition to traditional methods, such as CBT and DBT; Patricia utilizes creative therapy techniques, such as art, narrative and adventure therapy, whenever possible. Patricia’s goal is to make therapy a positive and life-changing experience for all involved.

Patricia Dunn

Surbhi Khanna, MD, Senior Medical Director

Dr. Surbhi Khanna completed her adult psychiatry residency training at University of Virginia, Charlottesville, VA. She then pursued her Addiction Psychiatry fellowship training at the Medical University of South Carolina, Charleston, SC. She is board certified in Adult Psychiatry as well as Addiction Psychiatry. She is able to prescribe buprenorphine for adult patients with opioid use disorder (like heroin or pain pills). Dr. Khanna believe in taking an integrative, holistic approach to mental health and particulate those who struggle with substance use disorders. Her goal is to provide high quality, patient-centric psychiatric care using a collaborative approach.

Surbhi Khanna

Dina Sztein, MD/MPH, Lead for Child and Adolescent Services

Dina Sztein M.D., M.P.H., grew up in Columbia, Maryland, and earned her BA at Haverford College in Pennsylvania. She completed her medical and psychiatry training at the University of Maryland/ Sheppard Pratt Residency Program and is a board-certified psychiatrist, as well as a board-certified child and adolescent psychiatrist. Her particular areas of interest include treatment of school-aged children with attention deficit disorders or anxiety disorders and public health initiatives.

Dina Sztein

Xian Zhang, MD, PhD

Dr. Zhang is board-certified in both general psychiatry and child & adolescent psychiatry. She earned her PhD degree in Behavioral Neuroscience at the University of Texas at Austin and did a postdoctoral training at Harvard Medical School in Boston. She completed her psychiatry residency training at St. Elizabeths Hospital in Washington, DC, and a Child and Adolescent Psychiatry fellowship training at the University of Maryland Medical Center in Baltimore.

Dr. Zhang believes in a holistic approach in understanding and treating problems through integrating biomedical, psychological, and social perspectives. She specializes in the treatment of children and adolescents with co-existing complex problems, including ADHD, anxiety, depression, mood disorders, autism spectrum disorder, OCD, disruptive and oppositional behaviors, psychosis, and PTSD.

Xian Zhang

Yang Roby, MD

Dr. Roby earned her Ph.D in Human Genetics and Neuroscience at Johns Hopkins School of Medicine and completed her adult psychiatry residency training at University of Iowa, Iowa City, IA. She works with adults (17 yo and up) who need medications for conditions including ADHD, anxiety, depression, mood disorders, psychosis, PTSD, and eating disorders. Her favorite part of practicing psychiatry is helping patients recover from mental illness and re-engage in a life that is meaningful to them.  

Yang Roby

Hardik Yadav, MD

Dr. Hardik Yadav is a Board Certified Psychiatrist as well as Addiction Medicine Specialist. He also earned a Masters in Public Health degree. Dr. Yadav specializes in treating a variety of mental illnesses like mood disorders, anxiety disorder, trauma related disorder, psychotic disorders, etc. He also provides medication-assisted treatment for drug use disorders including alcohol and opioids.  He is very knowledgeable in psychotropic medications and has been doing medication management for mental illness for over 8 years.

Dr. Yadav is well versed in different cultural backgrounds and understands the barriers and strengths to treat mental illness in different cultures. He is passionate about providing best interventions that is tailored to patient’s needs.  Dr. Yadav believes that mental health is equally important as physical health and takes a comprehensive approach in formulating treatment plan that focuses on both aspects.

Dr. Yadav believes in self-care as a core component in healing from any trauma and mental health challenges. He practices self-care in the form of playing soccer, cooking, exercising, reading and spending quality time with family.

Like someone said, “Courage doesn’t mean you don’t get afraid. Courage means you don’t let fear stop you.” Let’s be courageous together!

Hardik Yadav

Brittany Varner, MD

Dr. Brittany Varner grew up in Bowie, MD. She received her Bachelor of Science degree in Biology from University of Miami and an M.D. from Louisiana State University School of Medicine in New Orleans. She completed both her adult psychiatry residency and child/adolescent psychiatry fellowship at University of Maryland/Sheppard Pratt hospital systems.

Dr. Varner is board certified in both adult and child/adolescent psychiatry. Her particular areas of interest include treatment of mood disorders, anxiety disorders, and ADHD in children and adolescents.

Brittany Varner

Julia Merti, MD

Dr. Merti grew up in Kensington, Maryland, and earned a B.A. in English Literature from Georgetown University and an M.D. from the University of Maryland School of Medicine. She’s board certified in psychiatry and has a strong interest in treating addictions. She strongly feels any underlying psychiatric illnesses, such as anxiety and depression, must be fully treated to have recovery from addiction, and vice versa. Also important for recovery is the engagement of a patient’s support system, including key people in the person’s life and community resources.

She completed residency training in psychiatry at the University of Maryland / Sheppard Pratt Residency Program and a fellowship in addiction psychiatry at the University of Maryland Medical Center.

Edirin Uwayzor, CRNP, Medical Director

Edirin (pronounced A·di·rin) Uwayzor is an ANCC Board Certified Psychiatric Mental Health Nurse Practitioner. Edirin has experience working with diverse and underserved populations. Her professional experience includes working as a registered nurse in critical care, post-anesthesia care, and behavioral health. She takes a non-judgmental and holistic approach to the mental health and wellness by allowing her clients to explore, grow, and reach their personal goals. Her vision is to help her clients reach full potential in every aspect of their lives without mental health hindering them. Edirin is empathetic, genuine, non-judgmental, trustworthy, and reliable. She goes above and beyond to provide excellent care for the well-being of her patients. She treats various types of mental health concerns, including anxiety, depression, and ADHD/ADD.

“The only man who never makes a mistake is the man who never does anything” —Roosevelt

Edirin Uwayzor

Christina Gunner, LCSW-C

Addiction, depression, anxiety, and trauma can be lonely, but recovery from them doesn’t have to be. In my therapeutic approach I put emphasis on developing and practicing empathy for self and others, skill’s building, and exploration of past and present experiences impacting quality of life. Navigating healthy ways to cope with life’s many issues affords us the opportunity to heal and be who we want to be. I am here to offer support for growth through both guiding and following. If you are looking for someone to walk through the scary parts of your past and present, I am here to hold a safe and consistent space. My focus is on remaining empathetic while holding you to what you are capable of. Helping people through authentic and engaged therapy is important to me. We can create and maintain an environment of mutual trust and safety to express, explore, and examine where you are and where you want to go. There is no guessing when we work together. I hope that we can identify and accomplish your goals. Therapy is challenging and rewarding work. I am pleased to be provided the opportunity to work with you in that challenge.

I have a passion for learning, teaching, and engaging both clients and staff to push beyond their comfort zone to reach their goals. I completed my Masters of Social Work at the University of Maryland Baltimore School of Social Work in 2011. I use a myriad of therapeutic modalities to find a style and approach that is most effective for the individual being served. I have eight years of professional experience with addiction, and co-occurring mental health concerns including depression, anxiety, and trauma. I am in the process of completing training in Eye Movement Desensitization and Reprocessing (EMDR).

“There is no greater agony than bearing an untold story inside you.” —Maya Angelou

Christina Gunner

Sarah Gumpert, CRNP-PMH

Sarah Gumpert is a board-certified psychiatric nurse practitioner. Sarah works with teenagers ages 16+ and adults who need medications to treat psychiatric conditions, including: depression, bipolar disorder, anxiety, ADHD, PTSD and other mood and anxiety-related conditions.

Sarah’s philosophy is that a team approach leads to best treatment outcomes. Sarah has a special interest in working with the Deaf community and is fluent in American Sign Language.

Deaf and hard-of-hearing patients, to schedule an initial appointment, please email or contact Morgan at 443-708-5856, extension 104.

Sarah Gumpert

Kathleen Swanson, CRNP-PMH

Kathleen Swanson has a bachelor’s degree in psychology from Brown University and a BSN from University of Maryland. After working as a nurse in inpatient psychiatry, she returned to University of Maryland School of Nursing to complete the psychiatric nurse practitioner program with a MS degree.

Kathleen is a board-certified psychiatric nurse practitioner and works with teens and adults needing medications to treat psychiatric conditions, including: depression, bipolar disorder, anxiety, ADD/ADHD, OCD, PTSD and other mood and anxiety-related conditions. She enjoys educating and collaborating with patients, so they can be autonomous and informed participants in treatment. Her experience as a psychiatric nurse practitioner includes working with those who suffer dementia and medical illnesses in assisted living and nursing facilities, working with teens and adults with developmental disabilities and collaborating with primary care providers to offer integrated mental health care.

Kathleen Swanson

Temika Heyward, CRNP-PMH

Temika has worked as a Psychiatric Mental Health Nurse Practitioner and Family Medicine Nurse Practitioner for over 20 years.  She has expertise in general psychiatric treatment, addiction, crisis stabilization, nursing home care, and assisted living facilities. Particular areas of interest include depression, bipolar disorder, anxiety disorders, OCD, PTSD, and the use of buprenorphine for the treatment of opioid addiction.

Temika’s core values are providing care that focuses on the individual, realizing that each patient is unique and has specific health needs. Temika believes in building a long-lasting and trusting relationship with her patients. While in partnership with her patients, she ensures that confidentiality and safety are held paramount when working toward achieving mutually desired outcomes.

Temika Heyward

Candace Oglesby, LCPC, MAC, EMDR Therapist

“As a person-centered therapist, I use unconventional techniques in my eclectic and integrative approaches to treatment. Which not only includes talk therapy but also expressive therapies. This is the foundation of my theoretical orientation, one that has served clients in the office and community. The collaborative efforts between my clients and I calls for an environment that welcomes and fosters change, offering the tools necessary to be successful through guidance and motivational pursuits. I am a psychotherapists who specializes in substance use addiction. I also work with clients who struggle through various other conditions such as trauma, depression, anxiety, and adjustment disorders.

“I have a master’s degree in Clinical Psychology, with training and professional experience in cognitive-behavioral therapy, psychodynamic, mindfulness, dialectical behavioral therapy, crisis intervention, trauma informed approaches, and motivational interviewing. I look forward to assisting you in making life better.”

“It’s never too late to be who you might have been” —G. Eliot

Candace Oglesby

Jennifer Cary, MS, LCPC

Jennifer Cary is a Licensed Clinical Professional Counselor in Maryland, Virginia, and DC. She earned her Bachelor of Arts in Psychology from the College of Notre Dame of Maryland (now Notre Dame of Maryland University), her Masters of Science and Certificate of Advanced Graduate Studies in Clinical Community Counseling from Johns Hopkins University, and is currently working on completing the requirements for a Psy.D. from California Southern University.

Jenn has worked in various clinical settings and has taught undergraduate psychology. She has experience working with addictions, trauma, mood disorders, and life transition issues. She utilizes REBT, CBT, mindfulness, MI, and strengths based approaches to help patients learn to leverage their own personal strengths to gain mastery in their own lives. She also believes that self care and humor are important parts of the healing process. Seeking help for mental and behavioral health takes courage, but the path to wellness doesn’t need to be walked alone.

“It’s when we start working together that the real healing takes place.” —David Hume

Jennifer Cary, MS, LCPC

Administrative Staff:

Talithea Ransome, Associate Vice President of Operations

Meni Ashu, Office Manager

Rachel Baldus, RN

Rachel Baldus grew up in Baltimore, Maryland and earned a Bachelor’s degree in psychology from New York University. She worked for many years at Sheppard Pratt, and chose to return to school to study nursing. She has acquired a great deal of experience in psychiatric nursing working on an inpatient crisis stabilization unit, and has also trained as a chemical dependency detox nurse.

Rachel’s role at Gladstone is to coordinate patients’ medical and psychiatric care, and to communicate with insurance companies, in an effort to ensure that each patient receives comprehensive and seamless care.

Rachel Baldus


Main Phone: 443-708-5856
Fax: 240-708-4153

Deaf and hard-of-hearing patients, to schedule an initial appointment, please email or contact Morgan at 443-708-5856, extension 104.

Directions to Gladstone Psychiatry, 9841 Broken Land Parkway, Suite #211, Columbia, MD 21046: