Rebecca Kostopoulos, PMHNP

Dr. Sierra-Cintron is board-certified in adult psychiatry by the American Board of Psychiatry and Neurology and has been in practice for 12 years. Dr. Sierra-Cintron focuses her practice on medication management. She also engages in supportive therapy in a comprehensive way, focusing on the patient as a whole and not just the symptoms. Dr. Sierra-Cintron has a broad understanding of vitamin support as an adjunctive treatment to traditional medication. She has broadened her understanding of second-line treatment, having been certified in Electroconvulsive Therapy (ECT), conducting clinics in Clozapine and Long-Acting Antipsychotics (LOA), and even conducting assessments for patients interested in weight loss surgery. Dr. Sierra-Cintron has a comprehensive approach to treatment, and might consider the addition of therapy, either by referral or collaborating with an existing therapist for a more rounded approach and improved outcome. Dr. Sierra-Cintron received her medical degree from the Universidad Central del Caribe located in Bayamon, Puerto Rico. Upon graduation, she relocated to Philadelphia, where she started her residency program at Einstein Medical Center. After completing her training, she worked for 8 years in a community mental health clinic, treating an underserved population in all modalities of psychiatric care. In her 12-year career, Dr. Sierra-Cintron has treated both adult males and females, including seniors. This has led to varied and wide-ranging diagnoses during the length of her career. After leaving the community clinic setting, she started working for an outpatient clinic in a suburb of Philadelphia. Dr. Sierra-Cintron's current areas of focus are adults with Mood Disorders, Anxiety Co-Occurring Substance disorders, as well as patients with varied concomitant medical problems.‍

Dr. Jacob T. Kannarkat is an adult psychiatrist. Dr. Kannarkat's practice focuses on medication management. In his visits, he uses an integrative approach, blending an empathic, problem-solving orientation with an understanding that the reasons for an individual's condition can be complex. He has experience dealing with many forms of mental illness and works collaboratively with his patients and their other treatment providers in making a plan for recovery. Dr. Kannarkat completed undergraduate studies at the University of Florida. After receiving his medical degree at the University of Miami Miller School of Medicine, Dr. Kannarkat continued for residency at the University of Miami/Jackson Health System. He ultimately completed his training as Chief of Psychiatric Emergency Services at Yale School of Medicine. Dr. Kannarkat has experience working with adults of all ages who are dealing with depression, anxiety, bipolar disorder, PTSD, substance use disorders, and many other conditions.‍

Dr. Joshua Riederman is a board-certified psychiatrist with a specialization in the treatment of adults aged 18 to 65. Dr. Riederman obtained his undergraduate degree in brain, cognition, and neuroscience from the University of Michigan in Ann Arbor. He subsequently attended medical school at Nova Southeastern University in Fort Lauderdale, Florida, and completed his residency training at JFK Hospital in Palm Beach, Florida.

Dr. Riederman places a strong emphasis on establishing meaningful relationships with his patients and supporting them in achieving their individual life goals through effective treatment. He actively incorporates patient preferences into all treatment plans and integrates psychotherapy with medication management. Dr. Riederman recognizes the importance of educating patients about their care and dedicates time during each appointment to address any questions or concerns they may have.

In his clinical practice, Dr. Riederman begins by facilitating an open dialogue with patients regarding their primary concerns for the appointment. During initial consultations, he conducts a comprehensive assessment, which includes gathering relevant medical, familial, and social histories that may influence the course of treatment. In subsequent appointments, Dr. Riederman engages patients by inquiring about developments that have occurred since their last visit, as well as any issues related to medications or significant life events.

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Dianna's style is warm and interactive. She believes in treating everyone with respect, sensitivity, and compassion, including our country's service men and women. Dianna's approach combines an eclectic style of cognitive-behavioral therapy, motivational interviewing techniques and schema therapy techniques. She will tailor sessions to meet your unique and specific needs. Humor and deep insights are not incongruent to her practice or off limits!

Dianna is invested in a healthcare experience that addresses you wholistically. She is dually licensed as both a Family Therapist and Genetic Counselor with a combined 14 years of professional work

experience. If you have daily hassles, life transitions, or chronic/acute health conditions that are becoming overwhelming, you are in the right place. She is interested in functional therapy that permits you to move forward. Where relevant, she can gently integrate psychospiritual issues regardless of religious background

Dianna's process begins with your first step to get help. It takes courage to seek a more fulfilling and happier life and she will support and empower that desire. She works collaboratively with your healthcare team and addresses your questions and needs directly. She can work on the specific challenge or need you may have and brainstorm your best starting place. While she cannot live your life or make your decisions, she can be responsive to your needs and provide the anticipatory guidance that can transform your internal dialogue or open the door that mends family divisions.

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Penny Clark is a Licensed Professional Counselor, who earned her Master of Arts degree in Counseling Psychology at Monmouth University in West Long Branch, New Jersey in 2004. Penny also completed a one-year training to become a Certified Health Coach through the Institute for Integrative Nutrition in New York in 2017. Penny has more than 20 years of counseling experience and has worked with individuals, couples and families, beginning by working with 9/11 displaced workers and recovery workers, including police, firemen and EMTs, and then Hurricane Katrina and Superstorm Sandy families, after which she worked with bereaved military families, homeless veterans, and other homeless men. Penny has done individual, couples, career and relationship counseling. Penny has worked in various levels of care including inpatient, outpatient, intensive outpatient and partial care programs. Penny has answered the National Suicide Prevention Hotline 800-273-TALK, has worked in a psychiatrist’s office, and in her own private practice. Penny also worked at a drug and alcohol detox and rehabilitation program.  Penny has worked with individuals with Depression, Anxiety, PTSD, health and medical challenges, substance abuse, and the specific challenges that seniors face.

Penny provides a safe, therapeutic environment in which clients can share and process their thoughts and feelings, gain insight, and set and reach realistic and achievable goals. Penny’s primary goal is to develop a trusting relationship with her clients and helping them to improve their lives.

Penny uses Cognitive Behavioral Therapy, (CBT,) Positive Psychology, Psychodynamic Therapy, Solution Focused Therapy, Motivational Interviewing, and Psychoeducation while working with clients. Penny enjoys assisting clients in determining where they are and where they would like to be, the steps they need to take to get there, and in identifying and overcoming any obstacles that may be in their way.

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Dr. Upton Thomas is a board-certified psychiatrist who takes a warm, collaborative, and evidence-based approach to care. With a focus on treating mood disorders, anxiety, OCD, and substance use, he integrates psychopharmacology and psychotherapy to support patients in achieving meaningful change. He brings curiosity, creativity, and a deep respect for each individual’s story to his clinical work.

Patients often find Dr. Thomas easy to talk to and appreciate his calm, thoughtful demeanor. He emphasizes shared decision-making and believes that treatment works best when the patient’s values and voice are at the center. Dr. Thomas aims to create a safe space for honest dialogue and ongoing reflection as treatment evolves.

Dr. Thomas begins with a comprehensive evaluation to understand each patient’s mental health history, current concerns, and goals. He then develops an individualized treatment plan that may include medication, therapy, or both. He prefers to use the lowest effective dose of medications and often integrates psychotherapeutic strategies such as CBT, DBT, or insight-oriented work into his sessions.

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