Adele Veksman, MD

Karen Tonner, MSN, PMHNP-BC is an ANCC board-certified Psychiatric Mental Health Nurse Practitioner with over eight years of experience providing psychiatric care in outpatient and community mental health settings. She works with patients across the lifespan and treats a broad range of mental health conditions, including depression, anxiety disorders, attention-deficit/hyperactivity disorder (ADHD), obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD).

Karen primarily provides medication management in conjunction with supportive therapy, using evidence-based practices to help patients achieve symptom relief and improved functioning. Her approach to care is holistic, person-centered, and collaborative, emphasizing shared decision-making and individualized treatment planning. She strives to create a welcoming, approachable, and supportive environment where patients feel comfortable being themselves and actively participating in their care. She believes that understanding each patient’s unique experiences, goals, lifestyle, and strengths is essential to effective mental health treatment.

Karen earned her Bachelor of Science in Nursing from Kennesaw State University and her Master of Science in Nursing from the University of Alabama at Birmingham. She is dedicated to continuing education to remain current with psychiatric research and is committed to delivering compassionate, high-quality care that helps patients feel heard, respected, and empowered.

Dr. Kathryn Bertacchi is board-certified in both adult and child & adolescent psychiatry. Originally from California, she earned her medical degree from University College Cork in Ireland and completed residency and fellowship at Emory University. She has practiced in varied settings, including developing specialized clinics in eating disorders and gender-affirming care. She is a member of several professional organizations including AACAP, APA, and WPATH.

Dr. Bertacchi fosters an inclusive, nonjudgmental environment where patients feel safe to be themselves. She approaches care with curiosity, compassion, and deep respect for each person’s unique story, aiming to help individuals feel genuinely heard and supported throughout their treatment journey.

In early sessions, Dr. Bertacchi works collaboratively to understand patients' lives, goals, and challenges. While her focus is medication management, she integrates cognitive-behavioral, humanistic, and supportive techniques. She may recommend additional therapy as needed and particularly values working with youth and adults from diverse backgrounds.

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Sundahl understands the importance of collaboration and the therapeutic alliance when working with patients. He will clearly explain his findings and discuss treatment options he feels are reasonable. Dr. Sundahl thinks it is important for patients to have all the necessary information to make informed decisions when it comes to their psychiatric treatment.

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Cosima Robinson holds a distinguished profile as a Licensed Professional Counselor, a Licensed Chemical Dependency Counselor, and a National Certified Counselor. She earned her Master of Science in Counseling from University of Houston-Clear Lake. Presently, her licensure allows her to provide counseling services within the state of Texas.

Drawing upon her extensive experience, Cosima Robinson adeptly delivers tailored therapeutic interventions catering to individuals of all age groups. She proficiently addresses a spectrum of mental health challenges, including but not limited to depression, anxiety, and various life obstacles. Her therapeutic approach is characterized by an impartial, supportive, and uplifting environment designed to foster healing.

Cosima's professional background encompasses a diverse range of settings. She has proficiently guided individuals in contexts such as dual-diagnosis scenarios, substance abuse recovery, residential and intensive outpatient care facilities, correctional institutions, survivors of domestic violence, and at-risk youth and families.

Her counseling methodology is an incorporation of person-centered, cognitive-behavioral, and solution-focused modalities. Notably, she remains flexible in her application of techniques, ensuring that each intervention is meticulously tailored to suit the distinct requirements of her clients.

Lindsey Wittenhagen, LPC, earned a Master of Science in Clinical Psychology from the University of Texas Permian Basin in 2014 and is a Licensed Professional Counselor. She has extensive experience supporting individuals with anxiety, depression, ADHD, self-worth concerns, relationship challenges, stress management, divorce, and life transitions. Lindsey has worked in outpatient settings and as an advocate for trauma survivors, bringing a compassionate and informed perspective to her practice.

Lindsey’s passion is helping clients navigate the ups and downs of life, whether facing overwhelming stress, relational difficulties, or emotional struggles. Her approach is warm, collaborative, and grounded in the belief that healing happens when individuals feel truly seen and heard. Therapy with Lindsey is not about fixing what is “broken” but about fostering self-understanding, exploring what may be keeping someone stuck, and building tools for well-being. She creates a safe, judgment-free space where clients can show up authentically.

Lindsey begins therapy by gaining a thorough understanding of each client’s history, concerns, and goals during the initial session. She then collaborates with clients to develop individualized treatment plans that reflect their unique needs and aspirations. Progress is continually assessed, with goals and approaches adjusted as necessary to ensure growth, resilience, and meaningful change.

Dr. Schwartz is a board-certified Staff Psychiatrist at Talkiatry. He completed his residency at Bergen New Bridge Medical Center in Paramus, New Jersey, where he excelled in his leadership and knowledge, becoming the Chief Resident in just his third year of residency at the busiest outpatient behavioral health clinic in New Jersey. Upon completion of his third year of residency, he went on to become Chief Academic Resident of his program, which allowed him to bestow his knowledge of psychiatry on younger psychiatrists in training. After completing his residency in General Psychiatry, he went on to complete a fellowship in the prestigious Mount Sinai Health System in New York City, based primarily out of the Beth Israel location. During this fellowship he studied Consultation-liaison psychiatry, also known as psychosomatic medicine. It is an exciting subspecialty of psychiatry that focuses on the care of patients with comorbid psychiatric and general medical conditions. Consultation-liaison psychiatry deals with the understanding and advancement of medical science, education, and the provision of healthcare for medically ill and complex patients. Using his training, Dr. Schwartz can focus on using his extensive medication knowledge to help treat an array of psychiatric disorders. Despite medication management, he also works on a holistic approach to psychiatry, including working with the patient to get the proper therapy services when clinically indicated. During the initial interview, a thorough assessment is done, including any medical and psychiatric history, medications you may be currently taking, and supplements before any medication is dispensed. Using his knowledge in psychiatry and consult-liaison psychiatry, Dr. Schwartz's interests include depression, anxiety, ADHD, obsessive compulsive and related disorders, transgender patients on hormone therapies and post-surgical transition. He also has an extensive interest in medical illnesses with a psychiatric component such as cancer patients, transplant, HIV, and many others alike. He looks forward to working with you to enhance your emotional well-being.