Anastasia Ruiz, MD

Serena Mirchandani is a board-certified psychiatric nurse practitioner with extensive experience treating serious mental illnesses such as bipolar disorder and schizophrenia spectrum disorders. She also provides care for individuals with depression, anxiety, PTSD, OCD, autism spectrum disorder, and substance use disorders. Serena earned both a Master of Science in Nursing and a Doctorate in Nursing Practice in psychiatry from Columbia University. She completed a Nurse Practitioner Fellowship at Community Healthcare Network and worked at Bellevue Hospital for 2.5 years, providing care on an inpatient psychiatric unit for a diverse, underserved population.

Serena’s approach is grounded in open communication, evidence-based care, and deep respect for each patient’s lived experience. She prioritizes a collaborative, safe space where individuals feel heard, respected, and empowered. Her holistic style supports honest conversation, transparency in treatment options, and patient-centered goals.

Serena begins with a comprehensive assessment to understand each patient's full story—biological, psychological, and social. She then partners with patients to develop personalized, evidence-based treatment plans that align with their values and goals. She emphasizes education, transparency, and regular follow-up to support ongoing progress and informed decision-making.

Dr. Lauren McClairen is a psychiatrist board certified in General Psychiatry and Addiction Medicine. She completed her medical and psychiatric training at Meharry Medical College in Nashville, TN and a fellowship in Addiction Medicine at Baptist Memorial Hospital in collaboration with IAC (Integrated Addiction Care) in Memphis, TN. Dr. McClairen has clinical experience and practice working with other specialties and disciplines in treatment teams and integrated care models both in the inpatient and outpatient setting. She has held an academic appointment at Baptist Memorial Hospital where she enjoyed teaching and supervising medical residents and fellows in training. She most recently served as the Regional Behavioral Health Medical Director for a group of mental health clinics throughout Tennessee, and as the Chief of Psychiatric Services for a residential treatment facility in Mississippi that also had Partial Hospital and Intensive Outpatient Programming (PHP/IOP). She is experienced in treating patients with a variety of mental health diagnoses including but not limited to depression, bipolar disorder, anxiety disorders, ADHD, OCD, PTSD, and those with a history of substance use disorders. Dr. McClairen works collaboratively with her patients to provide treatments tailored to each patient's individualized needs. She prioritizes building trusting relationships and fostering open communication. Patients can expect a compassionate approach often with utilization of supportive therapy, mindfulness, and at times cognitive behavioral and psychodynamic psychotherapy techniques to address their psychosocial stressors and unique needs.

Megan is a Board-Certified Psychiatric Mental Health Nurse Practitioner specializing in medication management and various therapeutic techniques. She earned a Master of Science in Nursing as a Psychiatric Nurse Practitioner from Regis College and has board certification from the American Nurses Credentialing Center (ANCC).

Megan has extensive experience in psychiatric settings, including private practice, inpatient facilities, and substance use treatment programs. She has worked on community initiatives, such as the Mobile Suboxone Van program, which provides treatment to individuals in high-need areas.

She utilizes evidence-based practices in treating clients with mood and anxiety disorders, ADHD, trauma, and substance use disorders, among other mental health disorders.

The first priority is establishing a therapeutic relationship and providing adequate support, which can substantially impact outcomes. The combination of medication management and therapy can effectively reduce symptoms and contribute to the remission of mental health symptoms.

The first session will involve a 60-minute psychiatric evaluation to gather history and discuss current symptoms and goals. Clients starting medication will need more frequent 30-minute follow-up appointments for medication management and therapy, ensuring a positive response to treatment.

‍

Dr. Pereira is a board-certified adult psychiatrist who is dedicated to providing compassionate care for a wide range of mental health concerns. He received his Bachelor of Arts from Harvard University and his medical degree from The Donald and Barbara Zucker School of Medicine at Hofstra/Northwell, where he graduated with the Department of Psychiatry's award of distinction. He went on to complete his psychiatric residency training at Northwell Health's Zucker Hillside Hospital, with a specialization in the assessment and treatment of obsessive compulsive disorder and related conditions. Dr. Pereira's clinical approach emphasizes building trust with his patients and working collaboratively to develop an individualized treatment plan. He uses medication management along with cognitive behavioral therapy, exposure and response prevention, psychodynamic psychotherapy, interpersonal psychotherapy, and supportive therapy as needed. His practice treats a wide range of conditions, including depression, anxiety, OCD, family and relationship struggles, and other mental health issues. He has been trained in a wide range of settings including inpatient, outpatient, emergency departments, and behavioral health crisis centers. He also has experience teaching and supervising medical students and psychiatry residents.

Matthew Twomey, PMHNP, earned his BSN and MSN from the Massachusetts General Hospital Institute of Health Professions School of Nursing. He began his career as an adult psychiatric nurse practitioner in community health centers before commissioning as an officer in the U.S. Army Nurse Corps. After five years of active duty, he continued caring for service members and families at Fort Bliss as a civilian provider for nearly six years. He now practices in the private sector, bringing broad clinical experience to diverse patient populations.

Matthew is skilled in psychopharmacology, evidence-based practice, and telehealth delivery. He combines strong clinical expertise with a patient-centered approach to improve outcomes and streamline care. Patients can expect thoughtful collaboration, clear communication, and treatment planning grounded in the latest research and tailored to their individual goals.

He specializes in psychopharmacology and precise medication management tailored to each patient’s unique needs. He also integrates supportive psychotherapy, motivational interviewing, psychoeducation, and cognitive behavioral therapy. Through active listening and mutual respect, he fosters a safe, supportive environment where patients feel heard, engaged, and empowered in their care.

Dr. Thomas Spina is an adult psychiatrist who began his practice at Talkiatry after completing his psychiatry residency at the Eastern Long Island branch of Stony Brook University, where he treated a diverse patient population. Dr. Spina received his undergraduate degree from St. John's University in Queens where he studied Philosophy. Initially interested in a career in law, Dr. Spina decided to change gears and pursue a career in medicine after watching a relative struggle with her diagnosis of Diabetes Mellitus. Dr. Spina then completed medical school at Tel Aviv University in Israel, where he fell in love with psychiatry during his clerkship at Ichilov medical center. During that rotation, he came to appreciate how each patient has his or her own unique story, regardless of their diagnosis. Dr. Spina favors a holistic and integrative approach to psychiatry, combining medication management with supportive therapy, elements of cognitive behavioral therapy, while remaining open to other treatment modalities depending on the needs of his patients. When more focused therapy is indicated, Dr. Spina may recommend that his patient work with a provider specializing in a particular modality of therapy as part of their treatment. Dr. Spina treats adult patients with mood disorders including major depressive disorder and bipolar disorder, anxiety spectrum disorders, OCD, PTSD and specific phobias. In his spare time, Dr. Spina enjoys a variety of hobbies, including Brazilian Jiu-Jitsu, running, baseball, and exploring new eateries and shops.