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Our Team

Colleen Kestel

Colleen Kestel, MBA, RDN, LDN

VP of Operations

Colleen is a healthcare executive with a Master of Business Administration and a strong clinical foundation as a Registered Dietitian with extensive experience overseeing multidisciplinary teams across residential and outpatient behavioral health settings. She has led operations, compliance, and clinical support services, with direct oversight of nutrition services, regulatory readiness, and program performance across levels of care including Residential Treatment (RTC), Partial Hospitalization (PHP), and Intensive Outpatient Programs (IOP).

Her leadership experience includes the development and launch of residential treatment facilities, as well as the expansion and optimization of existing programs. Colleen has played a key role in building operational infrastructure, ensuring regulatory compliance, and driving quality improvement initiatives to support sustainable growth.

In addition to her operational leadership, Colleen brings a strong clinical foundation as a Registered Dietitian, with experience supporting patients and families navigating eating disorders, mental health conditions, and co-occurring disorders. She integrates this clinical perspective into her operational approach, ensuring patient-centered, high-quality care delivery.

In 2022, Colleen co-founded a Joint Commission-accredited Intensive Outpatient and Outpatient program in Will County, addressing a critical gap in access to care. She returned to SunCloud Health in 2024 as Director of Operations and now serves as Vice President of Operations, where she continues to lead strategic growth, program development, and organizational excellence.

-Our Research Team-
Timothy D. Brewerton, MD, DLFAPA, FAED, DFAACAP, CEDS-S
Professor Emeritus of Psychiatry and Behavioral Sciences
Dr. Christopher Womack
Medical Director, Child and Adolescent Psychiatry

Dr. Christopher Womack joins SunCloud as our Medical Director, Child and Adolescent Psychiatry.

Dr. Womack is board certified in Adult as well as Child and Adolescent Psychiatry, attending the University of Chicago Pritzker School of Medicine. Adult psychiatry residency and child fellowship training were completed at the University of Chicago Medical Center.

Dr. Womack’s treatment  philosophy hinges on strength based, evidence informed care, where collaboration is central to guiding individualized treatment.  He has experience caring for children and teens from varied backgrounds, appreciating the importance of how identity can inform treatment.

Favorite pastimes are cooking new recipes and exploring Chicago’s rich cultural diversity through its neighborhood and fine dining experiences.

Elizabeth E. Sita, MD
Medical Director of Adult Services
Dr. Elizabeth E. Sita, MD, is a Board Certified psychiatrist specializing in the care of patients with eating disorders. She completed her undergraduate training at the University of Chicago and graduated with Highest Honors. She then earned her medical degree at Northwestern University Feinberg School of Medicine and was recognized with the Chairman’s Award for Excellence in Psychiatry. She subsequently completed residency with the Department of Psychiatry and Behavioral Sciences at McGaw Medical Center of Northwestern University, where she was elected Chief Resident and received the Resident Psychiatrist Leadership & Service Award. Upon completing her training, Dr. Sita came to Ascension Alexian Brothers Behavioral Health Hospital, where she served as Assistant Medical Director of the Center for Eating Disorders and Director of Transcranial Magnetic Stimulation Services before transitioning to lead the new inpatient eating disorder unit as Medical Director of Eating Disorder Services at Ascension Saint Joseph Hospital – Chicago. In these roles, she has cared for a multitude of adolescents and adults struggling with anorexia nervosa, bulimia nervosa, binge eating disorder, and other eating disorders as well as severe, cooccurring mood, trauma, personality, and substance use disorders. Dr. Sita has been recognized throughout her training and practice for a commitment to excellence in patient care and for her ability to engage patients in their most challenging moments. Her passions include the care of treatment-resistant eating and mood disorders as well as questions of medical capacity and end-of-life decision making. She believes that, first and foremost, human connection is key to mental health and well-being and strives to share this philosophy in each and every patient encounter. She is excited to bring her expertise to SunCloud Health as the Medical Director of Adult Services!   VIDEO: Meet Elizabeth E. Sita, MD, Medical Director of Adult Services  
Lacey Lemke, PsyD
Assistant Vice President of Clinical Services

Dr. Lacey Lemke (she/her) is a licensed clinical health psychologist with specialized expertise in the treatment of eating disorders and the practice of medical and health psychology. She completed her doctoral training in clinical psychology with a Primary Care emphasis at the Adler School of Professional Psychology. Dr. Lemke went on to complete both her predoctoral clinical internship and postdoctoral fellowship through Ascension Health, where she gained advanced training working with individuals experiencing eating disorders and self-injurious behaviors, as well as within pediatric subspecialty settings including endocrinology, neurology, and adolescent medicine.

Dr. Lemke is deeply committed to providing evidence-based, compassionate care and collaborates closely with interdisciplinary teams to ensure comprehensive treatment. Her professional mission is to support patients in achieving their fullest potential by guiding them to the most appropriate level of care and empowering them to make meaningful, sustainable progress toward improved health and well-being.

VIDEO: 2. Meet Lacey Lemke, PsyD.