Corey Wasser, DO

MassachusettsHolly James Corrigan, RN, MSN, PMHNP, is a board-certified psychiatric nurse practitioner committed to helping people navigate their mental health with skill and heart. She earned her BSN from Russell Sage College in 2009, her MSN from Massachusetts General Hospital Institute for Health Professions in 2016, and completed Psychiatry Redefined’s Fellowship in Functional and Integrated Psychiatry in 2025. Holly keeps current by attending top conferences, like the International Trauma Conference in Boston, ensuring she’s always at the forefront of her field.

Holly’s philosophy is simple yet powerful: care should fit the person, not just the diagnosis. She’s passionate about tackling complex issues—suicide prevention, C-PTSD, chronic depression, ASD, OCD—and advocating for underserved communities. For Holly, it’s about delivering real, meaningful support to those who need it most.

Her career began as a registered nurse in neurology, pediatrics, and emergency care, before she found her calling in psychiatry. Since then, she’s provided medication management and supportive psychotherapy in outpatient clinics and worked in inpatient units serving adults and adolescents.

Holly believes in patient-centered care based on the individual, rather than focusing only on a diagnostic algorithm. The first appointment will include a comprehensive psychiatric evaluation and a discussion about what your goals of treatment are. Pharmacological and therapeutic recommendations are both important elements of the treatment plan. Follow up appointments will be more concise, but may include various therapeutic modalities, medication changes, and supportive psychotherapy.

Marie Thompson, PMHNP, has over a decade of experience practicing in outpatient settings. She earned her undergraduate, graduate, and post-graduate degrees from Ursuline College in Pepper Pike, Ohio. Marie is dual certified as a Family Nurse Practitioner and Psychiatric Mental Health Nurse Practitioner, allowing her to provide well-rounded, holistic care to her patients.

Marie uses a team-based approach to help patients meet their treatment goals. She is dedicated to creating a trusting, non-judgmental environment where individuals feel safe, heard, and supported. Her goal is to enhance daily functioning and improve each patient’s overall quality of life.

Marie creates individualized treatment plans to meet each patient's unique needs. She works collaboratively to develop patient-centered goals and uses a thoughtful, compassionate approach to guide treatment. Her process prioritizes open communication, shared decision-making, and long-term wellness.

Dr. Kimberly Ford completed her psychiatry residency training at Harvard University in Boston, Massachusetts. She has enjoyed treating patients for over 25 years in a variety of settings such as inpatient, outpatient mental health clinics, emergency room, and multidisciplinary clinics. She is talented in her ability to connect, understand, and empathize with her patients.‍She has expertise in treating patients with mood disorders, anxiety, PTSD, and incorporates psychopharmacology when needed, psychodynamic and supportive psychotherapy. She wholeheartedly believes that treating her patients holistically is of high importance, with a focus on their physical, emotional, mental, and spiritual well-being.

Dr. Katherine Vital-Daley is an adult psychiatrist at Talkiatry. She treats all adults and her passion lies in providing accessible care for women facing challenges throughout pregnancy, childbirth, and postpartum and in reproductive psychiatry. Dr. Vital-Daley's academic background is rooted in science, with an undergraduate degree in biochemistry and molecular biology from the University of California, Merced. She then pursued her medical doctorate at the Medical University of the Americas. Following medical school, she completed her psychiatry residency training. The first two years were spent at East Carolina University, Brody School of Medicine, with a culmination of her last two years of residency at Allegheny Health Network in Pittsburgh, Pennsylvania, to further specialize in women's mental health, which solidified her expertise in this vital area.‍At Allegheny Health Network's Women's Behavioral Health clinic, Dr. Vital-Daley honed her skills in treating a range of conditions, including depression, anxiety, PTSD, OCD, bipolar disorder, and related issues, and served as a medical provider for their intensive perinatal/postpartum outpatient clinic. She also developed a deep understanding of perinatal mental health, supporting patients coping with perinatal loss and traumatic birthing experiences. In her practice, she employs supportive psychotherapy and mindfulness along with evidence-based medication management, utilizing the most current clinical guidelines and treatment modalities. ‍Dr. Vital-Daley's approach is rooted in a collaborative treatment approach. She works closely with patients, exploring past and current stressors and any relevant medical conditions to develop a comprehensive understanding of their individual needs. Recognizing the importance of cultural competency, she incorporates patients' unique backgrounds, beliefs, and core values into her care plans.

Dr. Nicholas Sahagian is a Psychiatrist in Colorado who has been practicing since 2023. He completed his MD and Adult Psychiatry Residency at the Chicago Medical School at Rosalind Franklin University and earned his BA in Neuroscience at Skidmore College. Dr. Sahagian has experience managing a broad array of complex psychiatric diagnoses in patients of diverse socioeconomic, cultural, and clinical backgrounds. Outside of work, he enjoys hiking, biking, skiing, playing guitar, reading, and collecting board games.

Dr. Sahagian offers psychiatric medication management while also incorporating elements of cognitive behavioral therapy, motivational interviewing, internal family systems, and lifestyle interventions. He believes that every patient is unique, and he works to create a supportive environment where individuals feel heard and empowered in their care.

Grounded in the biopsychosocial model, Dr. Sahagian takes a collaborative, patient-centered approach. He partners with patients to develop personalized treatment plans that integrate biological, psychological, and social factors, with the goal of guiding them along their path to improved wellness.

Dr. Osamudiamen Osa-Edoh is board-certified in general adult psychiatry. He earned his medical degree from the University of Benin in Nigeria and completed his psychiatry residency at Meharry Medical College in Nashville, Tennessee, where he served as Chief Resident and received multiple honors. He previously served as Medical Director at Sumner Regional Hospital and Assistant Professor at Meharry Medical College.

As a psychiatrist, Dr. Osa-Edoh diagnoses and treats mental illnesses through medication management and psychotherapy. He believes in a kind, compassionate, and evidence-based approach that prioritizes patient needs and fosters a supportive, healing environment.

Dr. Osa-Edoh creates a welcoming, collaborative space where patients feel heard and supported. He takes time to listen, building trust and a strong therapeutic relationship. His goal is to partner with each patient to support their mental health and help them reach their personal wellness goals.