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Our Team

The leaders at SunCloud Health are incredibly passionate about serving the people they work with and their patients. Our team has the experience and the training to really execute a biopsychosocial approach.


  • Kimberly Dennis, MD, CEDS
    Kimberly Dennis, MD, CEDS
    Chief Medical Officer, CEO and Co-founder | Clinical Assistant Professor, Department of Psychiatry, University of Illinois at Chicago College of Medicine
  • Melissa Rocchi, ATR, LCPC
    Melissa Rocchi, ATR, LCPC
    Executive Director, Northbrook, Naperville and Lincoln Park Chicago
  • Sonja K Negrean, RN, BS, SCRN
    Sonja K Negrean, RN, BS, SCRN
    Director of Compliance and Nursing
  • David Newton, MBA
    David Newton, MBA
  • Dr. Nicole Bishop
    Dr. Nicole Bishop
    Psychologist, Clinical Director


We are delighted that you have chosen to consider receiving care at SunCloud Health. We are a recovery-focused therapeutic community. The SC team is comprised of a multidisciplinary team of health care providers who help you develop an individualized treatment plan to reach your goals. Our team consists of psychiatrists, registered dieticians, registered nurses, psychologists, therapists and counselors whose specialties include addiction, eating disorders, mood disorders and trauma recovery. The community at SunCloud includes you, fellow patients seeking greater health themselves and the SC staff. At SCH we focus both on the primary behavioral symptoms interfering with your life, as well as the underlying biological, psychological, social and spiritual factors, including adverse childhood experiences, that interfere with your ability to live a meaningful, joyful and free life. We use evidence-based treatment modalities to execute our mission to provide integrated care to persons with complex, co-occurring conditions who have not been adequately helped by treatment models that focus on one “primary” condition. We use a sophisticated treatment approach addressing multiple co-occurring disorders at the same time, under one roof in an integrated fashion.

Our Team

  • Selena Peters, MD
    Selena Peters, MD
    Addiction Medicine
  • Alexander Chevalier, MD
    Alexander Chevalier, MD
    Medical Director, Child and Adolescent Psychiatry
  • Chrisantha E. Anandappa, MD
    Chrisantha E. Anandappa, MD
  • Johnathan Coleman, MD
    Johnathan Coleman, MD
  • Dr. Lauren Pace, DO
    Dr. Lauren Pace, DO
  • Eleanor Annan, MD
    Eleanor Annan, MD
  • Yae Rim Lee, M.D.
    Yae Rim Lee, M.D.
  • Shale Marks, LCSW, CADC
    Shale Marks, LCSW, CADC
    Director of Outpatient Treatment Center, Northbrook
  • Colleen Kestel, MBA, RDN, LDN
    Colleen Kestel, MBA, RDN, LDN
    Director of Operations
  • Michelle Duda, MS, LCPC, CADC
    Michelle Duda, MS, LCPC, CADC
    Director of Outpatient Treatment Center, Chicago (Lincoln Park)
  • Kathy Pasternicki, Psy.D., CADC
    Kathy Pasternicki, Psy.D., CADC
    Intake Director
  • Hope Kravetz, MA, LCPC
    Hope Kravetz, MA, LCPC
    Director of Clinical Liaison and Educational Services & Director of Adolescent Outreach

Listen to select videos from SunCloud current and past staff members

Meet Anjali Khanna, Chicago Site Director at SunCloud Health

Meet Anjali Khanna, Chicago Site Director at SunCloud Health as she describes our willingness to help assist patients.

Meet Lauren Cali, Administrative Assistant at SunCloud Health

Meet Lauren Cali, Administrative Assistant at SunCloud Health as she expresses our desire to be a resource for our patients.

Lauren Cali, Administrative Assistant, on What to Expect on the First Call With Us

Lauren Cali, Administrative Assistant at SunCloud health, on What to Expect on the First Call With Us.

Emily Long, Clinician at SunCloud Health.

Emily Long discusses how patients benefit from an integrated treatment approach and how that contributes to a more effective treatment experience at SunCloud Health.

Mara Y Schieber, LCSW, CADC, Therapist at SunCloud Health.

Mara Y Schieber, LCSW, CADC, Therapist at SunCloud Health, is a clinician with more than 30 years of experience. Mara specializes in co-occurring disorders, addiction and began working with individuals with eating disorders more than 15 years ago. Mara brings a solid foundation in psychiatry, addiction, eating disorders and trauma. She is passionate in her work helping individuals discover and then learn how to live their lives in recovery.

Roseann Rook, CADC, Lincoln Park/Chicago Program Manager at SunCloud Health.

Roseann is a welcomed addition to the SunCloud Health team and will serve as the Program Manager at our Lincoln Park, Chicago location. She specializes in Process Addictions with a strong focus on Relationship Addictions and has been instrumental in the development of Addiction Programs and the implementation of addressing Process Addictions.

Treating co-occurring disorders, why it’s so important.

Roseann Rook, CADC, Lincoln Park/Chicago Program Manager at SunCloud Health, discusses why treating co-occurring illnesses is the best approach for a full recovery.

Megan Cummens LCPC, Treatment Coordinator at SunCloud Health.

Megan provides individual and family counseling to teenagers and adults, specializing in treating individuals with addictions, eating disorders, trauma, mood disorders, anxiety disorders, and self-injuring behaviors. She has worked in the residential setting, intensive outpatient, and outpatient settings. Megan believes in a holistic approach that is integrative, trauma-informed, psychodynamic, and empowering. She focuses on treating the whole individual, including emotionally, physically, psychologically, and spiritually. Megan’s counseling style is compassionate, empathic, collaborative, and she strives to meet each client where they are in their process.

How do your background, education and personal experiences influence your role at SunCloud Health?

Krista DeCeault, Registered Dietitian Nutritionist, shares how her personal background, education and experiences have shaped who she is and the role she plays on SunCloud Health’s treatment team.

Hear about our team from Dr. Dennis

Dr. Kim Dennis, CEO and Chief Medical Officer, discusses the background and experience of the staff members at SunCloud Health.

Click Here to listen to the podcast: “Addressing the Lack of Continuity of Care in Mental Health Services”, presented by NEJM Catalyst, a sister publication of the New England Journal of Medicine, featuring an Interview with Kim Dennis, MD, David Newton, MBA and Namita Seth Mohta, MD

About NEJM Catalyst: NEJM Catalyst brings health carexecutives, clinical leaders, and clinicians together to share innovative ideas and practical applications for enhancing the value of health care delivery. From a network of top thought leaders, experts, and advisers, their digital publication, quarterly events, and qualified Insights Council provide real-life examples and actionable solutions to help organizations address urgent challenges affecting health care.

VIDEO: Why do SunCloud therapists strive to never stop evolving for themselves and for their patients?

Dr. Marcia Nickow, PSY.D., CADC, CGP, Organizational and Senior Clinical Adviser at SunCloud Health, discusses the growth of SunCloud’s Chicago location under the excellent leadership of Hannah Carra, LCSW, (former) Chicago Site Director & Therapist and how every therapists at SunCloud Health strives to never stop personally evolving, for themselves and for their patients.

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Accreditations, Certifications & Licensing

LegitScript approved
DASA License. Department of Alcohol and Substance Abuse.
Joint Commission Behavioral Health Care Accreditation.
EDC Member
IAEDP Member

The Joint Commission signifies that all people always experience the safest, highest quality, best-value health care across all settings with a devotion to patient safety. The Gold Seal, is a symbol to the community and patients we serve that SunCloud Health has placed an emphasis on quality of care.

We are here for you.

One of the nations most trusted names in treating substance use addictions, eating disorders, mood disorders, PTSD and related traumas.
(866) 729-1012
Selena Peters, MD
Addiction Medicine

Originally from Chicago, Illinois, Selena Peters holds a BA in Neuroscience and attended the University of Chicago Pritzker medical school. She completed her fellowship in Addiction Medicine at the University of Hawaii under the esteemed training of Dr. William Haning, immediate past president of the American Society for Addiction Medicine. She is especially interested in the relationship between the brain, neurochemistry, and behavior.

Colleen Kestel, MBA, RDN, LDN
Director of Operations

Colleen began her clinical journey as a Diet Technician at a Residential Treatment Center (RTC) as she continued her education and earned her clinical licensure as a Registered Dietitian. Colleen then earned her Master’s degree in Business Administration with a concentration in healthcare. With this advanced degree, Colleen led a team of Dietitians as a Director of Nutrition Services for RTC, Partial Hospitalization Program (PHP) and Intensive Outpatient Program (IOP). Colleen then combined her passion for nutrition and operations and was promoted to Assistant Director of Operations. Within this position, Colleen assisted in the development and operations including but not limited to RTC, PHP, and IOP for adults and adolescents. During this time, Colleen supervised and led an extensive team in clinical operations.

Outside of operations, Colleen has experience working individually with patients of all ages and families regarding their relationship with food, body, and overall functioning. Colleen believes addictions do not discriminate; all ages, genders and backgrounds deserve a chance at improving their outlook on life and doing so through gentle nutrition therapy, intense group or individual therapy, and joining a diverse community to no longer feel alone.

In 2022, Colleen co-founded a Joint Commission Accredited IOP and Outpatient Program in Will County as she recognized the need for quality treatment for mental health and eating disorders in the community. Colleen returned to Suncloud Health in 2024 as Director of Operations and is assisting with program growth and development.