Alexander Wittenberg, DO

More Clinicians

Dr. Krista Alexander is a board-certified psychiatrist who loves equipping her fellow human beings to feel and function better. She studied medicine at the University of Texas Southwestern Medical School and completed her residency at Duke University. She has worked in both private practice and integrated primary care/behavioral health care settings. She is a member of the American Psychiatric Association and the North Carolina Psychiatric Association. Krista offers medication management and supportive psychotherapy for mood disorders, anxiety disorders, trauma, ADHD, substance use disorders, and other mental health issues. She strives to embody "relational prescribing” and believes that med management is most effective in the context of a relationship of mutual trust, emotional safety, and shared decision-making between provider and patient. She has trained in psychodynamic psychotherapy and various forms of cognitive behavioral therapy, and tailors her approach to each patient's individual strengths and needs. Krista understands that the needs of the whole person must be addressed in order to facilitate growth and healing. She enjoys collaborating with fellow medical/mental health providers to address a patient's complex needs as an integrated team.

Theresa Colberg, MD

Staff Psychiatrist

Dr. Theresa Colberg is a board certified adult psychiatrist. She offers guidance with navigating difficult and painful emotions that may result from mood disorders, stressful life situations, the loss of a loved one, traumatic events, attachment traumas, or neurodevelopment disorders. Within a safe, and supportive working relationship, Dr. Colberg will strive to reach an understanding of your unique situation, identify the issues that are interfering with progress, and develop a plan to better identify and achieve your goals. Previous to joining Talkiatry, Dr. Colberg served as a clinical psychiatrist for the VA Healthcare System, providing care for veterans with a predominant focus on treatment of post traumatic stress disorder. She has also worked collaboratively as an integrated psychiatrist for a primary care FQHC, treating psychiatric symptoms within a primary care setting. Dr. Colberg completed her Psychiatry Residency from Mount Sinai-Beth Israel in New York City and obtained her medical degree from Temple Medical School in Philadelphia. She offers 60-minute initial appointments and 30-minute follow-up appointments, and she won't hesitate to collaborate with other mental health experts as necessary to better support your needs.

Gusta Shurdut, MD

Staff Psychiatrist

Dr.Gusta Shurdut is a board-certified adult psychiatrist with 8 year experience. She completed her medical training at SUNY Downstate Medical center in Brooklyn, and psychiatric residency at Mount Sinai Beth Israel, NYC. After her residency, she worked as an assistant professor at Mount Sinai Psychiatric Ambulatory Services. Dr.Shurdut graduated magna cum laude from Columbia University with an undergraduate degree in biology. Prior to moving to New York, she obtained a degree in communications and public relations and worked as a journalist at her hometown in Latvia.

Dr.Shurdut believes in individual, empathetic, and collaborative treatment approach. Through her residency and work experiences, Dr.Shurdut has developed expertise to treat various mental health conditions including mood disorders, anxiety, OCD, ADHD, PTSD. While her primary focus is medication management, she also incorporates CBT, psychodynamic and supportive psychotherapy.

Dr.Shurdut’s goal is empowering patients to participate in their healthcare choices. As a psychiatrist, she feels honored to witness the complexity of the human experience, and curious to explore the factors that contribute to it. On intake appointment, she will take time to understand your concern, provide assessment, discuss treatment options and collaboratively decide on most appropriate action. The follow up appointments are usually 30 minutes and include a psychotherapy modality.

Nidhi Sharoha, DO

Staff Psychiatrist

Dr. Nidhi Sharoha is a double board certified psychiatrist in Psychiatry and Consultation Liaison Psychiatry. She completed her undergraduate training at Stony Brook University followed by medical school at New York Institute of Technology College of Osteopathic Medicine. She has completed both a Residency in Psychiatry and Fellowship in Consultation Liaison Psychiatry at Nassau University Medical Center. Dr. Sharoha has held academic appointments at Stony Brook University Hospital, practicing as a consultant psychiatrist and Associate Director of Consultation Liaison Psychiatry Fellowship. She has been deeply involved in teaching throughout her years. She has a genuine interest in treating a vast array of psychiatric disorders including depression, anxiety, bipolar disorders, post-traumatic stress disorders, and obsessive compulsive and related disorders. She also has experience in treating patients with medical comorbidities and has training in issues related to women's health. Patients looking for a psychiatric provider will find that Dr. Sharoha has a gentle approach to diagnosis and management of her patients. She believes in the principle that body and mind are interconnected, which allows her to provide comprehensive care to all of her patients.

Jenna Hartman, DO

Staff Psychiatrist

Dr. Jenna Hartman is double board certified in General Psychiatry and Addiction Psychiatry. Dr. Hartman graduated from Tufts University before completing medical school at New York Institute of Technology College of Osteopathic Medicine. She then completed residency at Maimonides Medical Center, where she was a Chief Resident, and then pursued an addiction psychiatry fellowship at Mount Sinai Beth Israel. Dr. Hartman was also trained in psychodynamic psychotherapy by the Psychoanalytic Association of NY. Following her training, Dr. Hartman returned to Maimonides Medical Center, where she worked as an attending adult outpatient clinic, treating patients from many different backgrounds with a wide array of diagnoses. She holds a special interest in treating mood disorders, anxiety disorders, and OCD. Dr. Hartman uses a compassionate and thoughtful approach in order to form a collaborative partnership with her patients. She believes in treating the person as a whole and tailoring treatments to each individual's specific needs. Dr. Hartman works with patients in 30 30-minute follow up sessions, where in addition to medication management she provides supportive and at times psychodynamic therapeutic techniques.

Marc Whaley, MD

Staff Psychiatrist

Dr Marc Whaley is a Board Certified Psychiatrist in Adult Psychiatry, with extensive clinical experience over the past 50 years, mostly in outpatient treatment, and some in-patient settings, in addition to Forensic (legal) ones. He received his undergraduate degree at Johns Hopkins in Baltimore and his medical degree at Tufts Medical School in Boston, and then went on to train at Tufts New England Medical Center in Boston, for his psychiatry residency. He has held leadership roles, Chief of Department of Psychiatry in a community hospital, President of the local Psychiatric Chapter of the Massachusetts Psychiatric Society, and founder of a private group outpatient psychiatric practice on Cape Cod called The Psychiatric Collaborative. In 2018, he closed his private practice, seeking more free time in the later years. It did not take long, however, to get back to active practice, first by reviewing files for insurers around the issue of medical necessity, disability, and other psychiatric determinations. He got his first experience in Telepsychiatry when working remotely for a community hospital, far from his home, evaluating patients presenting to their busy ER; He experienced this as a practical and efficient way of delivering psychiatric services. When that contract ended after 3.5 years, he learned about and joined Talkiatry to work as a Staff Psychiatrist, in their well-organized comprehensive program. Dr. Whaley has been recognized by his peers for his career achievement, and he was the 2022 recipient of the Outstanding Psychiatrist Award for Clinical Psychiatry from the MA Psychiatric Society. He has also been a regular panel member, over the past 13 years, for a monthly NPR Radio Talk Show, ( WGBH Cape Cod affiliate, WCAI), The Point with Mindy Todd, focusing on multiple mental health topics.

John Whittier, MD

Staff Psychiatrist

Background and credentials

Dr. John Whittier is a board-certified psychiatrist. He earned his Bachelor of Arts in Molecular, Cellular, and Developmental Biology from the University of Colorado at Boulder and went on to obtain a master’s degree in Medical Science from Loyola University Chicago. He completed his medical training at the Robert Larner, M.D. College of Medicine at The University of Vermont and returned to Colorado for his psychiatry residency at the University of Colorado School of Medicine. While in residency, he specialized in the Psychotherapy Scholars Program and has since gained four years of experience treating psychiatric conditions through telehealth.

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Treatment approach

Dr. Whittier primarily focuses on medication management for general psychiatric conditions. His approach is individualized, ensuring that each patient receives a treatment plan tailored to their unique needs. He integrates supportive therapy, medications, and evidence-based alternative therapies to provide a flexible and comprehensive approach. In addition to his general practice, he maintains a psychodynamic psychotherapy panel where he helps patients explore developmental and relational patterns that contribute to their symptoms. His specialties include treating depression, anxiety, adjustment disorders, PTSD, insomnia, bipolar disorder, and ADHD.

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What you can expect in a first visit

During the first visit, patients can expect a one-hour comprehensive intake during which Dr. Whittier thoroughly evaluates their symptoms, medical history, and personal goals. He provides treatment options that prioritize flexibility, allowing patients to take an active role in their care. Follow-up visits typically last 20 to 30 minutes, focusing on assessing treatment progress and making necessary adjustments. For those engaged in psychodynamic psychotherapy, longer one-hour sessions are available for in-depth exploration of underlying psychological patterns.

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Why Talkiatry?

We’re a virtual mental health practice that makes it easy to find great care. We combine quality and convenience to help you thrive—faster. Our providers, like this one, are highly trained experts who specialize in medication management and collaborate with you on a treatment plan that fits your needs and comfort level.

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Sebrina Cotton, LPCC

Staff Therapist

Sebrina Cotton is a passionate advocate for mental health and holistic well-being. With over 7 years of experience in the mental health field, she has worked with diverse populations seeking support in managing various challenges, including depression, anxiety, trauma, relationship/marital issues, grief/loss, and life transitions. Sebrina's approach is person-centered and collaborative. She will hold you accountable to the goals you want to accomplish through a combination of empathy, active listening, and skillful interventions. Sebrina welcomes you to a warm and safe space to bring all of who you are to each session. She will walk alongside you through your therapy journey towards a more fulfilling and meaningful life. In her time outside of sessions, Sebrina enjoys working out at the gym, teaching/practicing yoga, and traveling.

Karelis Sierra-Cintron, MD

Staff Psychiatrist

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.‍

Tiffany Abtahi, MD

Staff Psychiatrist

Dr. Tiffany Abtahi is board certified in adult psychiatry and has been in practice for over 6 years. She completed her residency at Icahn School of Medicine, Elmhurst Hospital Center program where she served as Chief Resident in her final year. After completing her residency training, Dr Abtahi worked as a staff psychiatrist in the VA Medical Center focusing on PTSD, depression, and anxiety. Dr. Abtahi has held an academic appointment at the University of UT Southwestern medical school and has spent her professional career supervising/teaching medical students and psychiatry residents. Dr. Abtahi's practice focuses on medication management and providing psychoeducation to her patients. However, if indicated, Dr. Abtahi may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome. Dr. Abtahi has experience treating a large variety of mental health conditions across a variety of populations. She strongly believes in tailoring treatments through a holistic and patient-centered approach based on individual and multi-faceted histories. Dr. Abtahi looks forward to working with you.

Russell Silverberg, LMHC

Staff Therapist

Dr. Silverberg is a licensed counselor in Arizona, California, and Washington, and has been licensed since 2008. Dr. Silverberg has extensive experience working in the mental health field with varied client demographics, helping clients with varied conditions including a Federally Qualified Health Center.

Historically, Dr. Silverberg attended the University of Delaware, majoring in psychology and minoring in cognitive science. After a master’s degree from the University of Phoenix, he went on to complete a Doctor of Behavioral Health degree from Arizona State University in 2011.

Dr. Silverberg has an eclectic approach to mental health issues including pieces of ACT, CBT, DBT and Motivational Interviewing. He believes in the mind-body connection and that both affect each other.

Rebecca Farias, MD

Staff Psychiatrist

Dr. Farias is a board-certified physician in both adult and child & adolescent psychiatry, with a focus on the diagnosis and treatment of depressive disorders, anxiety disorders, trauma- and stressor-related disorders, and ADHD. Dr. Farias graduated magna cum laude with a Bachelor of Science degree from the University of Houston, majoring in Biology with a minor in Chemistry. She then pursued her medical education at Texas Tech University Health Sciences Center, earning her Doctor of Medicine degree. Dr. Farias completed a three-year psychiatric residency at TTUHSC, followed by fellowship training in child and adolescent psychiatry. She completed her first year of fellowship at the University of Texas Medical Branch in Galveston and her second year at TTUHSC. With a diverse clinical background, Dr. Farias has gained experience in a variety of settings, including academic psychiatry, consult liaison psychiatry, intensive outpatient programs (IOP), partial hospitalization programs (PHP), emergency psychiatry, and outpatient psychiatry. This broad range of experience allows her to provide comprehensive, individualized care to patients at all stages of life. Dr. Farias takes a holistic approach to treatment, incorporating both medication management and psychotherapy. She utilizes principles from Cognitive Behavioral Therapy (CBT), Acceptance and Commitment Therapy (ACT), and supportive psychotherapy, recognizing that a combined approach leads to better outcomes for patients.

Alexander Wittenberg, DO

Education and training

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