Kerstin Asquith, MD

Nisha Saintelus Deratus, LPC, is a proud HBCU graduate of Prairie View A&M University with a Master’s in Counseling and over eight years of experience in the mental health field. She has provided care in inpatient psychiatric hospitals, partial and intensive outpatient programs, community mental health, and private telehealth practice. Nisha supports clients facing anxiety, depression, trauma, grief, bipolar disorder, life transitions, anger management, and relationship challenges.

Nisha offers a warm, approachable, and nonjudgmental space where clients feel seen and supported. She believes in a collaborative approach to therapy, working alongside clients to identify the root of their struggles and develop a personalized plan for growth and healing. Her personable nature and tailored care help clients feel comfortable and empowered throughout the process.

In the first session, Nisha reviews teletherapy expectations and confidentiality, and conducts a psychosocial assessment to better understand your background and goals. Together, you’ll explore current challenges, create a vision for your future, and build a practical plan. Using CBT and ACT, she helps you develop tools and insights to apply between sessions for continued progress.

Dr. Kristofer Willers is a board certified adult psychiatrist. He earned his undergraduate degree and Masters in Teaching from Boston University, followed by his medical degree from the

University of Massachusetts Medical School. Dr. Joondeph-Breidbart completed his residency in general adult psychiatry at Cambridge Health Alliance, a Harvard teaching hospital.

Currently, Dr. Kristofer Willers serves as a staff psychiatrist at Harvard University Health Services, where he works with both undergraduate and graduate students. He has developed significant expertise in working with LGBTQ individuals through his involvement with the Gender and Sexuality Clinic at Cambridge Health Alliance and the  LGBTQ Interdisciplinary Team at Harvard University Health Services. While he has extensive expertise in treating college-aged young adults, his practice also includes a broad range of patients, with a particular specialization in Obsessive-Compulsive Disorder (OCD). He is trained in Exposure and Response Prevention Therapy, a highly effective treatment for OCD.

Dr. Kristofer Willers takes a holistic approach to mental health care, integrating therapy into his sessions and collaborating with patients to develop individualized medication regimens that best meet their needs. His gentle and understanding approach helps create a supportive environment for his patients, fostering their mental and emotional well-being.

Dr. Thistlethwaite is a board eligible adult psychiatrist and internal medicine physician. He completed his medical education at West Virginia University School of Medicine. Following completion of medical school, Dr. Thistlethwaite completed residency training at WVU/Charleston Area Medical Center with a dual specialization in internal medicine and psychiatry. Dr. Thistlethwaite's training included treatment of patients both in the inpatient and outpatient setting as well as management of patients with comorbid medical conditions. During his training Dr. Thistlethwaite became passionate about approaching patients in a holistic manner that addressed both their physical and mental health. He is especially passionate about ensuring that patients with mental health disorders are provided with appropriate general medical care as they are a marginalized and underserved group. Dr. Thistlethwaite's practice focuses on medication management for a wide array of conditions including depression, anxiety disorders, bipolar disorder, obsessive compulsive disorder, tic disorder/Tourette's, and post traumatic stress disorder. Dr. Thistlethwaite incorporates supportive psychotherapy, cognitive behavioral therapy interventions, and some psychodynamic therapy skills in his practice as well. Dr. Thistlethwaite believes in a collaborative and holistic approach to mental healthcare that incorporates the patient as well as all members of the healthcare team in every aspect of care.

Margaret Gorelick is a board-certified Psychiatric-Mental Health Nurse Practitioner (PMHNP-BC) through the ANCC. She earned her Master of Science in Nursing from Fairfield University and her Bachelor of Science in Nursing from Western Connecticut State University. With 10 years of psychiatric experience, she began her career at MedStar Georgetown University Hospital in neurology and neurosurgery, later transitioning to psychiatry at Yale New Haven Hospital and Stamford Hospital. She provides outpatient medication management and psychotherapy, including psychodynamic therapy and CBT, for adults 18+, and has led grief support groups.

Margaret practices with a nonjudgmental, respectful approach grounded in active listening and trust. She believes healing begins with understanding and is dedicated to supporting individuals through every stage of their mental health journey.

The first visit is a comprehensive psychiatric evaluation to review history, symptoms, and goals, forming a personalized plan. Follow-ups are 30 minutes and focus on monitoring medication response, adjusting treatment as needed, and providing ongoing therapeutic support to ensure safe, effective progress.

Dr. Seth Flesher is double board-certified in adult psychiatry and addiction medicine.  Dr. Flesher’s practice focuses on medication management of psychiatric illness without the use of controlled substances.  Typically, he offers this in conjunction with supportive or emotionally focused therapy in 30-minute follow-up visits. However, occasionally Dr. Flesher may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome.

Before joining Talkiatry Dr. Flesher was Medical Director of Advanced Psychiatric Services [complex/high profile cases] at Kings County Hospital and Unit Chief of the Covid19 positive unit.  He was also a clinical professor at Downstate Medical College where he was voted educator of the year numerous times by psychiatric residents and medical students.  Dr. Flesher is a graduate of the prestigious combined 6-year BS/MD program at The Sophie Davis School of Biomedical Education.  He did research at the neuropsychiatric branch of the National Institute of Mental Health, completed his psychiatric residency at St. Lukes/Roosevelt Hospital, and he received his master’s degree in public health from Columbia University.

Dr. Flesher believes that psychiatry should start with a thorough assessment to arrive at an accurate diagnosis.  Then a discussion with the patient of the different evidence-based options available.  Followed by shared decision-making to arrive at an effective treatment plan to achieve the goals that the patient identifies as being important.  This should be done in an honest, open, non-judgmental, but realistic environment.  Understanding that the ultimate goal is to get the patient to a position where they will no longer need medication and/or therapy.

Dr. Rodriguez is a board-certified adult psychiatrist, who is also fluent in Spanish. He completed residency at North Florida Regional in Gainesville via the University of Central Florida, where he also served as chief resident for education. He received his medical degree from Lincoln Memorial University – DeBusk College of Osteopathic Medicine in Tennessee. He also holds a master’s and bachelor’s degree in engineering from the University of South Florida, in Tampa.

Dr. Rodriguez has worked with a wide array of patients across various medical settings and has experience treating patients with psychiatric illness who may also be suffering from medical comorbidities, such as obesity, hypertension, pain, and diabetes. He has been deeply involved with teaching and emphasizes psychoeducation while working in collaboration with his patients to help tailor their personalized treatment plan. His primary focus has been on treating adults with depression, bipolar disorder, anxiety, ADHD, OCD and PTSD.

Dr. Rodriguez has an approachable, patient-centered style, combined with a passion for optimizing sleep as it pertains to management of a psychiatric illness and overall well-being. He offers supportive therapy as part of his medication management visits, and at times may also offer cognitive behavioral therapy to address underlying stressors which may be contributing to one’s presenting ailments. He may also recommend including a therapist in your care team to optimize outcomes.