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Our Team



We’ve assembled a highly-credentialed team of doctors, therapists, and specialists. They have collectively worked with thousands of clients throughout their careers in helping adolescents and young adults struggling with drug and alcohol abuse and/or mental health issues like depression, and anxiety.

We firmly believe a highly experienced, dedicated team with a passion for working with teens and young adults is the single most important piece of a program. Our team is fully committed to our mission of relentlessly pursuing successful clinical outcomes.

Our Leadership Team

Dr. Nathan Moore, MD
Medical Director, Colorado Springs & Cascade Canyon

Dr. Nathan Moore is Board-certified by the American Board of Family Medicine. Dr. Moore attended attended Duke University School of Medicine and obtained his M.D. in 1995.

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Dr. Jennifer Montague
Medical Director, Colorado Springs Detox Center

Dr. Montague currently serves as the Colorado Springs Detox Center's Medical Director.

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Savanna Klippel, APRN, FNP-BC
Family Nurse Practitioner, Colorado Springs Detox Center & Cascade Canyon Teen Residential

Savanna currently serves as the Family Nurse Practitioner for Colorado Springs Detox Center & Cascade Canyon Teen Residential. 

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Dr. Alfonso Cappa, Psy. D
Licensed Clinical Psychologist, Colorado Springs

Dr. Alfonso Cappa is Sandstone Care's Licensed Clinical Psychologist who focuses on comprehensive psychological testing and evaluation of clients.

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Nathan Moore, MD
Medical Director, Colorado Springs & Cascade Canyon

Dr. Nathan Moore is a board certified physician certified by the American Board of Family Medicine. He is also board certified in addiction medicine through the American Board of Addiction Medicine.

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Sherry McAtee, MHA, MS, BSN, RN, CRNP-PMH, PMHNP-BC, FACCP, MAJ (RET) USAF
Psychiatric Nurse Practitioner, North Bethesda

Sherry is our team’s Psychiatric Nurse Practitioner, with 32 years experience in healthcare.

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William Lawson, MD
Medical Director, North Bethesda

William Lawson serves as the Medical Director for Sandstone Care's North Bethesda facility. 

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Brannon Pruet, PhD-c, LPC, CAC II
Program Director, Denver

Brannon is a Licensed Professional Counselor and Certified Addiction Counselor Il currently serving as the Program Director at Sandstone Care Denver.

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Sahar Givpour, MS, LPC-R, CSAC, ADS
Program Director, Reston

Sahar currently serves as the program director for the Reston, Virginia office.

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Sarah Fletcher, LPC, LAC
Clinical Director

Sarah earned her Masters degree in Rehabilitation Counseling with a specialization in substance use disorder from Southern Illinois University in Carbondale.

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Jillian Luttrell, LCSW
Program Director, Colorado Springs Rehab

Jillian currently serves as the Colorado Springs Outpatient Program director.

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Annabella Cordova-Barnes, M.A., LPC
Program Director, Boulder

Annabella is the program director for Sandstone Care's Denver and Broomfield locations.

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D'ri Jones, LCSW, CAC III
Primary Therapist, Denver

D'ri is a Licensed Clinical Social Worker and a Certified Addictions Counselor, Level III.

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Angie Marks, LPC
Primary Therapist, Denver

Angie is currently serving as the primary therapist for our outpatient programs at our Denver office. She has over 18 years experience working in the mental health field with various social service agencies.

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Peter King, LCPC
Primary Family Therapist, North Bethesda

Peter currently serves as a Primary Family Therapist at Sandstone Care's Bethesda, Maryland location.

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Erika Alhashmi, LPC
Assessment, Intake, and UR Coordinator

Erika currently serves as the assessment, intake, and UR coordinator at our Denver location.

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Marissa Gavel, LPC, NCC
Young Adult Primary Therapist

Marissa currently serves as the young adult primary therapist at our Denver location.

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Stevie Williamson, MA
Primary Therapist, Broomfield

Stevie currently serves as the primary therapist at our Broomfield location.

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Dani Denver, MA, LPC Candidate
Primary Therapist, Denver

Dani currently serves as the primary therapist for the Denver PHP program.

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Kaley Chiles, LPC, LAC
Family Therapist, Cascade Canyon

Kaley runs her private practice and the family immersion program for Sandstone's Cascade Canyon adolescent residential facility.

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Samantha Miller, LPC
Primary Therapist, Boulder

Sami currently serves as the adolescent primary therapist at Sandstone Care's Boulder location.

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Michelle Pelle, LSW
Primary Family Therapist, Denver & Boulder

Michelle facilitates family programming, including the multi-family group, and family therapy between the Denver and Boulder locations.

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Nina Davachi, LGPC
Primary Therapist, North Bethesda

Nina is a Licensed Graduate Professional Counselor.

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Megan Johnson, MFT
Assessment & Intake Coordinator, Cascade Canyon Teen Residential

Megan currently works at Sandstone Care supporting the adolescent treatment program at our Colorado Springs facility.

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William "Liam" Grafton III
Information Systems Administrator & Data Specialist

Liam currently serves as the Information Systems Administrator & Data Specialist across all of Sandstone Care's locations.

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Anne Kahn, LPC, CAC II
Utilization Review & Intake Coordinator, Denver & Boulder

Anne is a Licensed Professional Counselor and a Certified Addiction Counsellor II.

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Ashley Whiting
Discharge Planner, Colorado Springs & Cascade Canyon

Ashley currently serves as the discharge planner for Colorado Springs Detox Center & Cascade Canyon Teen Residential.

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Trisha Johnson, LPC, RYT
Primary Therapist, Denver

Trisha is an advocate for wellness and self-care and specializes in mindfulness meditation practices. She currently serves as the primary therapist at our Denver office.

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Priscilla Gonzalez, MA
Lead Admission Coordinator

Priscilla currently serves as an Admissions Coordinator across all locations. She is the first point of contact for families and clients reaching out to Sandstone Care for support.

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Meg Wainwright, LCPC
Program Coordinator, North Bethesda

Meg is currently program coordinator for Sandstone Care.

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Jessica Jeffery
Clinical Outreach Ambassador, Maryland

Jessica Jeffery is a Montgomery County native, born and raised in Germantown, MD.

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Ben Sigley
Recovery Services Manager, All Locations

Ben is the house manager for our men's recovery living house in Denver, called Rally Point.

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Caleb Krull, CAC I
Compliance Manager, Colorado Springs

Caleb Krull is a Compliance Manager who has been working professionally in substance abuse since February 2016.

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Todd Wilfawn
Residential Manager, Rally Point Denver

Todd is the house manager for our men's recovery living house in Denver, called Rally Point.

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Dan Cowles
Lead Behavioral Health Technician, Colorado Springs Detox Center

Daniel is a Colorado native and is currently a Lead Behavioral Health Technician at the Colorado Springs Detox Center.

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Travis Howieson, CAC I
Lead Behavioral Health Technician, Colorado Springs

Travis currently works as a Behavioral Health Technician at our Colorado Springs location.

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Rowan Hill
Empowerment Director

Rowan is the first point of contact during the hiring and onboarding process for new staff members at Sandstone Care.

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Drew Powers, CAI-II, CSAC-A
Director of Outreach & Admissions

A native of Northern Virginia, Drew has worked in the substance use disorder field for nearly a decade.

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Jess Barry, BA
Regional Director of Business Development & Aftercare

Jess oversees outreach and aftercare planning for all of our Colorado locations.

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Emily Grotheim
Recruiter, Denver

Emily is a Colorado native that has recently come home after spending the last 10 years in Minneapolis and Milwaukee.

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Walter Baker
Insurance Advocate Lead, Denver

Walter is our Insurance Advocate Lead and works in our Denver office.

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Luke Mattey
Accounting & Finance Manager

Luke began with Sandstone Care as an outreach ambassador, but is now serving as an accounting and human resources associate. 

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James Devenport
Insurance Adovcate

James currently serves as a healthcare billing & coding specialist across all our locations. 

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Katie Pine
Senior Insurance Advocate, All Locations

Katie currently serves as a senior insurance advocate for all of our locations. She comes to us with four years of experience as a medical insurance biller and account manager.

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Amanda Porter, LPC, LAC
Program Director, Cascade Canyon Teen Residential

Amanda Porter currently serves as the Program Director at Sandstone Care’s Adolescent Residential Program at Cascade Canyon.

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Louis Hrabar, NCRC-II, NCIP
Admissions Coordinator, All Locations

Louis currently serves as an admissions coordinator for all Sandstone Care locations.

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Marina Vidrine
Colorado Clinical Outreach Ambassador

Marina currently serves as the Colorado clinical outreach ambassador. 

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Rebecca Rowell, RN
Nursing Supervisor, Colorado Springs Detox Center

Rebecca earned her Bachelor's degree in Nursing from the University of New Mexico. She has worked in addictions and mental health nursing for 2 years.

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Smitty Jost
Executive Assistant

Smitty currently serves as an executive assistant and comes to us with over 30 years of varied administrative experiences, most of which took place in the mental health field.

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Matthew File
Insurance Advocate Specialist

Matthew is an Insurance Advocate Specialist with Sandstone Care and is extremely excited for what his future in recovery holds. 

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Jeff Hoffman
Academic & Vocational Advisor, Denver
Tyler Riley, Certified Recovery Coach
House Manager

Tyler currently serves as a full time house manager in the Denver men's sober living home.

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Carrie Schimmelpfennig, RD, CEDRD
Registered Dietician, All Locations

Carrie is currently the registered dietitian at Sandstone care, supporting all Colorado facilities through one on one nutrition counseling, group presentation during both programming and multi-family group, and food service support.

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