Meet Our Staff


Bill Anderson, MSW, LCSW

Chief Executive Officer

Bill has over 23 years of experience in behavioral health, beginning at an emergency shelter for teenagers and an acute day treatment program for mental health. He was previously at MARR for 15 years, during which he served as a case manager, primary counselor, Director of Admissions, and eventually as our Director of Business Development. Bill then moved on to serve as Chief Executive Officer for both Blue Ridge Mountain Recovery Center and Sierra Tucson. Most recently, Bill was the Chief Executive Officer of Lakeview Behavioral Health. Bill believes deeply in MARR’s mission and treatment model, and he is committed to leading us as we continue to navigate an increasingly complex treatment field.

Michael Dorr, MBA

Chief Financial Officer

Michael joined the team at MARR in 2018. Mike received his undergraduate degree in Business Administration from the University of Hartford, later receiving his MBA from Emory University. He brings a wealth of corporate finance experience leading accounting and finance departments working for both for profit and not for profit organizations as well as having business start-up and ownership experience.

Marcia Smith, LPC, NCC

Director of Right Side Up

Marcia graduated from Argosy University in 2007, earning her master’s degree in Professional Counseling. She is a licensed professional counselor in the state of Georgia and a member of the National Board of Certified Counselors (NBCC). She started her career in the field of addiction treatment while completing her internship at Café 458, where she serviced disabled homeless men and women dealing with mental health and chemical dependency issues. Soon after completing her internship, Marcia joined MARR’s Right Side Up program as an Employment Specialist. Over the past five years, Marcia has held other positions with Right Side Up, including Intake Coordinator and Primary Counselor. In 2013, she accepted the position as Program Director.


Lauren Davis, MS, LPC

Director of Admissions

Lauren earned her undergraduate degree in Psychology from the University of Georgia, and her master’s degree in Rehabilitation Counseling from Georgia State University. She began her career as a counselor in an inpatient hospital setting, where she worked predominantly with individuals who were suffering from a primary mental health diagnosis. In February 2015, Lauren joined MARR as an admissions coordinator, and has since been promoted to Director of Admissions. Lauren is extremely passionate about helping addicted individuals transition into a life of community, hope, and recovery here at MARR.

Kristen Render, LMSW

Clinical Assessment Counselor

Kristen received her undergraduate degree in social work and her master’s degree in social work from the University of Georgia. Her internship background was in providing domestic violence crisis services, adolescent group therapy, and co-occurring substance abuse and mental health treatment. Kristen began working as an Assessment Counselor at MARR in 2016. In her role at MARR, Kristen loves getting to work with individuals and their families to offer education about substance abuse as well as ethical, clinical assessments for treatment. Kristen has a passion for those affected by substance abuse and a drive to connect individuals and their families with treatment for lasting recovery.

Liz McVicker

Director of Business Development

Liz McVicker joins the MARR team with 15 years of experience in management and strategic planning. Most recently, Liz worked in business development at a local treatment program and has developed many strong relationships in the mental health and recovery industry. Liz started her own journey to recovery in 2007. She is passionate about seeing others find the help they need. Her energy, positivity, professionalism make her a valuable member of the MARR family.

Keri Siebrasse

Business Development Representative

Keri has recently joined the MARR team with enthusiasm for developing genuine relationships with local providers and experts in the field of Substance Abuse Treatment. Her heart for recovery stems from her own experience in treatment and the value of combined therapeutic and clinical treatment MARR is known for. She brings with her entrepreneurship, a digital marketing background, life experience, and a passion for everyone to be in long-term recovery.


Natasha Kyle-Vitonis, MS

Day Treatment Counselor

Natasha received her bachelor’s degree in psychology from Kennesaw State University, and her master’s degree in Clinical Counseling Psychology from Brenau University. Natasha’s clinical interests include 12-step Recovery and Dialectical Behavior Therapy skills. Natasha is also trained in the evaluation, administration, scoring, and interpretation of cognitive and personality assessments. She brings a gentle and empathic approach to group and individual therapy, and is passionate about helping women discover new coping skills in order to deal with uncomfortable emotions and make peace with their genuine selves

Dannie McAdams, RN, BSN

Registered Nurse

Dannie has over 23 years of nursing experience, specializing in ER/Trauma and Critical Care), and over 1 1/2 years in Substance Abuse Treatment. She helps clients with health awareness and management, self-care, and overall physical well-being, and works with the clinical staff to develop an individualized care plan for each client. She is passionate about helping clients be present in each moment and helping them realize they they are not alone in the recovery process.


William Atkins, MA, LPC, CRC

Director of the Men's Recovery Center

Will has been at MARR since 2013. Previously a Residential Manager, Will was named Director of the Men's Recovery Center in 2020. He hopes to assist clients in finding meaning and purpose in their lives as they begin their personal journey towards recovery.

Dave Devitt, MA, LPC, Ed. S in Counseling Psychology

Primary Counselor

Dave has worked in substance abuse for 27 years, 22 of those being here at MARR. He works with our Professionals’ Program and leads a group called “Thinking About Your Thinking.” Dave enjoys seeing clients shift their perception of themselves as the effects of active addiction abate over time. He considers it a privilege to watch good people discover the joy of a clearer mind and a less burdened heart.

Rick McKain, MA, MS in Counseling, LPC, MAC

Professionals' Liason

Rick has been working as a Counselor since 1988, and he has been at MARR since 1993. He is a certified Relapse Prevention Specialist and a member of the Society for the Advancement of Sexual Health. He specializes in working with men’s issues and sexual compulsivity. He started our “Building Better Relationships” group in 1996. He is passionate about seeing men connecting with each other in recovery and seeing the benefit in becoming emotionally honest, vulnerable, and demonstrating willingness.

Robert Day, MA, LPC

Primary Counselor

Bob started as an intern at MARR in 2014 and then moved into the role of Primary Counselor after completing his degree at Richmont Graduate University. He specializes in breaking down denial in young adult clients and integrating counseling and spirituality. He uses a collaborative, non-judgmental, insight-oriented approach that helps clients connect how their past traumas, relationships, and experiences have molded how they interact with their lives in the here and now. He is passionate about helping people reconnect with their values and with one another.

Mark Anderson, MS, NCC

Primary Counselor

Mark joined the team at MARR in 2018. He is passionate about helping individuals who struggle with addiction to move past their shame and guilt, to help them reach out and (re-)establish genuine human connections. He creates a collaborative partnership with each client and walks with them as they embark on their journey of recovery. Mark believes deeply in the power of connection through the therapeutic community, individual and group therapy, and participation in a 12-step program.

Todd Valentine, LCSW

Residential Manager/Men's Alumni Coordinator

Todd has 15 years of clinical experience in the field of addiction, and he has been at MARR since 2006. He specializes in the integration of mindfulness, and he is passionate about helping men find joy in recovery and practice vulnerability that brings them out of isolation and into community. Todd leads clients in mindfulness practices, guided meditations, and recreational activities to reconnect with their bodies and learn to recognize emotions.

Marcedes Holliday, RN

Nurse Manager

Marcedes has 13 years of nursing experience, including ER, home health, substance abuse, and psychiatric. She works to ensure that clients have proper health evaluations, testing, and medication. She is passionate about helping others to reach their health and wellness goals, and she works to develop warmth and trust with each client.

Jordan Detweiler, CACI

Residential Manager

Jordan is a Certified Addiction Counselor and has worked at MARR since 2015 as a Residential Assistant, a Clinical Assessment Counselor, and now a Residential Manager. As a MARR alumnus, Jordan has firsthand experience with the effectiveness of the therapeutic community, and understands the importance of facing life’s challenges with spiritual principles. He enjoys the opportunity to be able to help others start the process of recovery and enter into this familiar and highly successful model of treatment.


Millicent Parker, MS, LPC, M. Div

Family Program Coordinator

Millicent has been at MARR for 11 years, six of those as a Family Counselor. She is passionate about supporting, guiding, and at times challenging clients and families as they take ownership of who they are and the life that they experience. She encourages others to tell their story, and walks with them to identify the changes that need to be made in order for them to cultivate a healthier way of being.


Julie Shields

Manager of Donor Relations

Julie joined MARR in 2018 following 13 years of corporate sales experience. She enjoys helping donors identify and match their passion with opportunities that help people in their recovery journey. Julie plans and orchestrates events like our Annual Golf Tournament and our Celebration of Recovery Banquet, as well as overseeing our Annual Campaign.

Tamara Whisnant

Billing Administrator

Tamara joined the MARR team in 2016, but she has been in the accounting and finance field for 28 years. She makes the financial process as simple as possible for families with a loved one coming into treatment. Tammy is one of the first people that new clients see when they are starting treatment, and she is also one of the last people they see when they discharge. She loves seeing the transformation that happens in clients.

Candace Verdin


Candace has worked at MARR since 2014, and she is an invaluable part of our Accounting Team. During her time here, she has developed a new perspective on addiction. She has grown to really care for MARR’s mission of bringing lasting, total recovery.