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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.

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
Senior Medical Director

Dr. Montague is the senior medical director for our inpatient and outpatient levels of care. Trained in both Addiction Medicine and Internal Medicine, she embodies an integrative...

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Savanna Klippel, APRN, FNP-BC
Family Nurse Practitioner

Savanna Klippel currently serves as the Family Nurse Practitioner at Colorado Springs Detox Center & Cascade Canyon Teen Residential. In 2012...

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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

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

Sherry is our team’s Psychiatric Nurse Practitioner, with 32 years experience in healthcare. She works collaboratively with the clients to diagnose, treat, and...

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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

Brannon is a Licensed Professional Counselor and Level Two Certified Addiction Counselor. Brannon has 20 years of clinical experience working...

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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 Fletcher serves at the Clinical Director of Sandstone Care, overseeing all clinical services for the organization. Sarah holds...

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Jillian Luttrell, LCSW
Program Director

Jillian Luttrell is a Licensed Clinical Social Worker with experience in working with diverse populations in a variety of behavioral health settings ranging from...

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

Annabella is a primary therapist for Sandstone Care's Denver and Broomfield locations. She received her Master's in Counseling...

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D'ri Jones, LCSW, CAC III
Primary Therapist

D'ri is a Licensed Clinical Social Worker and a Certified Addictions Counselor, Level III. She earned her master's degree from the University of Denver. D’ri has 15 years...

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Angie Marks, LPC
Primary Therapist

Angie is a Licensed Professional Counselor currently serving as the primary therapist at our Denver facility. For the last 18 years, she has been employed...

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Peter King, LCPC
Program Director

Peter is a Licensed Clinical Professional Counselor in the state of Maryland and earned his Master of Arts degree in Clinical Mental Health Counseling from...

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Erika Alhashmi, LPC
Assessment, Intake, and UR Coordinator

Erika is a Licensed Professional Counselor with over nine years working in the mental health field, six primarily with alcohol and substance abuse. She earned ...

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Marissa Gavel, LPC, NCC
Young Adult Primary Therapist

Marissa is a Colorado native with a diverse background of service. She earned a BA in journalism from Colorado State University and went on to write...

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Stevie Williamson, MA, LPCC
Primary Therapist

Stevie graduated with a bachelors of Science in Human Development and Family Studies with a concentration in Pre-Health from...

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Dani Denver, MA, LPC
Primary Therapist

Dani is a Licensed Professional Counselor. She completed her Master of Arts in Clinical Mental Health Counseling from Denver Seminary and earned her Bachelor of...

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Kaley Chiles, LPC, LAC
Family Therapist

Kaley began her career doing play therapy with young children. She struggled with what she saw as the limited capacity children had to utilize treatment...

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Samantha Miller, LPC
Primary Therapist

Sami works as the adolescent primary therapist at Sandstone Care's Boulder location. She has worked with the organization...

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Michelle Pelle, LSW
Primary Family Therapist

Michelle is a Licensed Social Worker and she completed her Masters in Social Work with a concentration in Family Systems at the University of Denver. Prior to becoming...

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Nina Davachi, LGPC
Primary Therapist

Nina is a Licensed Graduate Professional Counselor. She has experience working with individuals and families to find hope in their struggles and freedom...

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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

Ashley currently serves as the Discharge Planner for Colorado Springs Detox & Residential Center as well as Cascade Canyon Teen Residential Center. As...

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Trisha Johnson, LPC, RYT
Primary Therapist

Trisha completed her Master’s degree in Counseling and her Yoga teacher training in Central Florida. From there she relocated to Colorado to pursue her passion...

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Priscilla Gonzalez, MA
Lead Admissions Coordinator

Priscilla currently serves as Lead Admissions Coordinator for Sandstone Care. She has been with the us since 2018, providing consistent support to families...

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Meg Wainwright, LCPC
Program Coordinator

Born and raised in Washington, DC. Meg moved to Utah for her undergraduate and graduate degrees, earning her Master's degree in Mental Health...

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Jessie Jeffery
Clinical Outreach Ambassador

Jessica currently serves as the Maryland clinical outreach ambassador. She is a Montgomery County native, born and raised in Germantown, MD. She began...

Phone Number: 240-630-4890
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Ben Sigley
Director of Housing

Ben is the house manager for our men's recovery living house in Denver, called Rally Point. Prior to joining the Sandstone team...

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Caleb Krull, CAC I
Compliance Manager

Caleb Krull is a Compliance Manager who has been working professionally in substance abuse since February 2016, although he does have personal...

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Todd Wilfawn
Residential Manager

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

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Daniel Cowles
Lead Behavioral Health Technician

Daniel began his career in the field in 2018 as a Behavioral Health Technician with University Park Detox and Assessment Center. Daniel went on to work as...

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Travis Howieson, CAC I
Lead Behavioral Health Technician

Travis began his work in addiction treatment working as a Behavioral Health Technician at the Raleigh House of Hope in Arvada, CO. After a year...

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Rowan Hill
Empowerment Director

Prior to joining Sandstone Care, Rowan worked at Open Sky Wilderness Therapy as a field guide and family services guide. He worked with adolescent...

Phone Number: 720-526-0480
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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. Over the years, Andrew has worked in a variety of positions...

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Jess Barry, BA
Regional Director of Business Development & Aftercare

Jess oversees business development, aftercare and discharge planning and alumni services in Colorado. Prior to joining Sandstone Care, Jess worked...

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Emily Grotheim
Recruiter

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 is the Community Outreach Associate for Sandstone Care in the DC Metro area. Born and raised in southern Ohio, Luke received his BS in Family...

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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

Amanda Porter is the Program Director at Sandstone Care’s Adolescent Residential Program at Cascade Canyon. She has over 8 years of clinical mental health and...

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Louis Hrabar, NCRC-II, NCIP
Admissions Assistant Manager

Louis has worked in the mental health and addiction field since 2010, and is proud to serve as an Admissions Coordinator at Sandstone Care. His dedication...

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Marina Vidrine
Clinical Outreach Ambassador

Marina currently serves as the Colorado clinical outreach ambassador. Prior to joining Sandstone Care, Marina worked for 3 years as the clinical coordinator...

Phone Number: (720) 773-4574
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Rebecca Rowell, RN
Nursing Supervisor

Rebecca earned her Bachelor of Science in Nursing from the University of New Mexico in 2016. She started out in Arizona working as a nurse...

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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

Jeff is the Academic and Vocational Coordinator at Sandstone Care’s Denver location. Before working at Sandstone, Jeff has worked as a GIS analyst, academic...

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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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