John Whittier, MD

Dr. Alejandra Vivas is board-certified in adult psychiatry and board-eligible in child and adolescent psychiatry. She completed her general psychiatry residency at Montefiore Medical Center and a child and adolescent fellowship at Mount Sinai School of Medicine. Dr. Vivas brings extensive experience from outpatient, emergency, and telepsychiatry settings. She has advanced training in CBT, Motivational Interviewing, and Psychodynamic Therapy. Fluent in English and Spanish, she is committed to culturally sensitive, individualized care.

Dr. Vivas fosters a warm, respectful, and professional space where patients feel seen and empowered. She values open communication and builds collaborative relationships to align treatment with each person’s values, goals, and lifestyle. Her approach is integrative and flexible, grounded in evidence-based methods to support lasting, meaningful change.

Dr. Vivas begins with a thorough evaluation to understand each patient’s history and goals. She creates customized treatment plans that may include therapy, medication, or both. Drawing on CBT, Motivational Interviewing, and Psychodynamic Therapy, she adapts care to meet evolving needs, aiming to relieve symptoms, foster resilience, and support long-term well-being.

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Dr. Arballo is board-certified psychiatrist who completed medical school at Lake Erie College of Osteopathic Medicine. He received residency training at University of Texas Health - San Antonio where in addition to clinical training was appointed resident chair of the Quality Improvement and Patient Safety Committee.

Since graduation he has been a staff psychiatrist and the military unit director at Cumberland Hall Hospital providing comprehensive care to child, adolescent, adult, and geriatric patients.

Dr. Arballo provides evidence-based medication management and psychotherapy to address mental health conditions. He is a strong advocate for patient autonomy, quality improvement and psychoeducation.

Denise White, PMHNP, has worked in the mental health field for over 30 years following the completion of her Bachelor’s degree in Psychology from Suffolk University in Boston. She began her career as a mental health technician in a geriatric residential program and later pursued additional education in nursing, earning an Associate Degree in Nursing from Quincy College, a Bachelor’s Degree in Nursing from South University, and a Master’s in Nursing from Eastern Kentucky University. Over the years, she has held diverse roles in adult and children’s case management, residential and intensive outpatient programs, inpatient psychiatric care, and crisis stabilization. Denise has provided care in both inpatient and outpatient settings as well as through hospital consult services across the country.

Denise prides herself on her ability to empathize with her patients and meet them exactly where they are in their journey. She believes that trust is the foundation of the therapeutic relationship and works diligently to create a supportive, nonjudgmental environment where patients feel safe, heard, and respected.

In the initial evaluation, Denise focuses on gathering comprehensive information to form a complete understanding of each patient’s unique background and needs. From there, she develops an individualized treatment plan that aligns with the patient’s prioritized goals. Each session begins from that foundation, allowing her to support patients at their own pace as trust deepens and progress unfolds.

Dr. Jaime Thomas, DO, earned her Doctor of Osteopathic Medicine from Oklahoma State University Center for Health Sciences and completed her psychiatry residency at Einstein Medical Center in Philadelphia. She is dedicated to providing culturally sensitive, holistic mental-health care, supporting patients through life’s most challenging moments by addressing the whole person—mind, body, and environment.

Dr. Thomas emphasizes understanding each patient’s unique story and identifying meaningful avenues for change. Her approach integrates lifestyle modifications, nutrition, spirituality, physical activity, community, and medication when appropriate, ensuring care is thoughtful, personalized, and collaborative.

Treatment begins with comprehensive sessions to explore a patient’s life story, concerns, and goals. Follow-up visits focus on fostering growth, maintaining stability, and supporting long-term well-being, creating a safe space for sustainable mental-health improvement.

Dr. Adeola Mustapha is a board-certified psychiatrist with experience across outpatient, inpatient, and community mental health settings. She completed her psychiatry residency at Indiana University School of Medicine – Vincennes in July 2024 after earning her medical degree from Ross University School of Medicine. Recognized for her exceptional psychotherapy skills, Dr. Mustapha received therapy awards in both her PGY3 and PGY4 years. Her background reflects a commitment to blending strong clinical training with compassionate, patient-focused care.

Dr. Mustapha creates a warm, collaborative, and supportive environment where patients feel respected and understood. She believes in the power of psychotherapy combined with evidence-based psychiatric care, always striving to integrate both in treatment. Open communication and clear, realistic goal setting are central to her approach. She is committed to a holistic perspective that considers emotional, physical, cultural, and social well-being. With an emphasis on empowerment, Dr. Mustapha encourages patients to take an active role in their healing journey.

Dr. Mustapha begins with a comprehensive evaluation to learn each patient’s history, concerns, and goals. She develops individualized treatment plans that may integrate therapy modalities such as CBT, DBT, TF-CBT, psychoanalysis, and FETI, along with medication management when appropriate. Using a goal-oriented, step-by-step process, she tracks progress and adapts treatment as needs evolve. Through ongoing dialogue, she ensures patients feel supported, informed, and engaged throughout their care. Her aim is to foster long-term resilience and overall wellness, not just symptom relief.

Dr. Kristina Foreman is a board-certified psychiatrist and child and adolescent psychiatrist who earned her medical degree from St. George’s University and completed both psychiatry residency and fellowship at the University of Vermont Medical Center. She served for four years as an attending on a high-acuity inpatient adolescent unit in Denver, leading a multidisciplinary team in the care of complex cases. She also presents nationally on Positive and Lifestyle Psychiatry and has taught these approaches to fellows and residents.

Her style is open, thoughtful, and relationship-focused, creating a space where patients feel safe sharing what matters most. She brings a therapeutic mindset to every encounter and practices strengths-based care to help people connect with resilience and agency. Trained in the Vermont Family-Based Approach, she values family involvement and blends medication management with therapeutic principles and lifestyle psychiatry to support emotional flexibility and values-driven change.

Dr. Foreman begins by gaining a full understanding of each patient’s history, strengths, challenges, and hopes for treatment. She builds individualized plans that may include medication, lifestyle strategies, psychotherapy-informed tools, and family participation when helpful. She incorporates ACT, DBT, CBT, and positive psychology concepts to foster insight and skill development. Follow-up visits focus on refining the plan so progress feels steady, collaborative, and aligned with patient goals.

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