Meet the Staff

Meet Our Staff 

Office: 803-748-5020 ext 5#

Margie Williamson

Margie Williamson, Executive Director, began with The Arc of South Carolina in April 2012. She has been in the nonprofit sector for over 10 years and brings a unique family perspective to the role of the Executive Director's position for The Arc of South Carolina because she is the parent of a child with Autism. She is passionate about her work with individuals with intellectual and developmental disabilities. Through her early college years, she worked diligently with children on the Autism Spectrum, assisting with caregiver relief as well as advocating for services. During her time with The Arc of South Carolina, she has become a visible spokesperson on issues impacting individuals with intellectual and developmental disabilities, as well as their families.

DeAndrea McMullen, Director of Case Management, joined The Arc of South Carolina in May 2015. She is a native of Rock Hill, SC, and a 2009 graduate of Francis Marion University. DeAndrea's passion to work with individuals with special needs started with her work with children on the Autism Spectrum as a behavioral therpist. She is enthusiastic about the opportunity to continue to serve individuals with disabilities with such a great organization.

DeAndrea McMullen 

Cell: 803-529-5308

Rachel Harry, Case Management Supervisor, was raised in San Diego, CA. She joined our team at The Arc of South Carolina in August 2016 after receiving her Bachelor's Degree in Public Health from the University of South Carolina. She is dedicated to working with individuals with lifelong disabilities to help them reach their maximum potential, and has done this prior to joining The Arc by providing direct patient support at various centers for those with disabilities. She is excited to work for an organization where she can help achieve increased respect and autonomy for individuals with disabilities.

Rachel Harry 

Office: 803-748-5020 ext 2#

Cell: 803-665-0155

Joe Covey, Case Manager, is originally from New Jersey but lived in south Florida for the last 6 years. He joined the Arc of SC in October 2018 after moving to Myrtle Beach. Joe has a Bachelor's degree in Psychology from Hofstra University. Before coming to the Arc of SC, Joe worked with people with special needs and in substance abuse treatment. He is passionate about this population and is eager to provide assistance to individuals with disabilities and their families. 

Joe Covey 

Cell: 843-252-2579

Alyssa Rosenfeld Tanczos, Case Manager, moved to South Carolina from New York and joined the Arc of South Carolina in January 2018.  She has been in the non profit special needs field for 13 years working with individuals with disabilities of various capacity while in New York. While in New York her experience ranged from working with adults in a day program, community setting and residential setting.  Alyssa was also a classroom teacher for a program for adults with disabilities  and worked with children in a residential foster facility.  Alyssa has always had a passion to work with individuals with disabilities and help others be successful as possible. In Ohio, Alyssa helped with wheelchair sports team and while in New York assisted with Special Needs soccer team.  She enjoys working with individuals to help them be as independent as possible and work with wonderful families.  

Alyssa Tanczos 

Cell: 803-243-0542

Ashleigh Little, Case Manager, joined the Arc of South Carolina in September 2018.  She is a lifelong resident of the South Carolina Upstate, who enjoys photography and creating art.  She received her Bachelors Degree in Art Therapy from Converse College (2011) and Masters Degree in Human Behavior from Capella University (2014).  Ashleigh has a heart for working with others to improve their lives as demonstrated by her history working with various populations.  She is trilled to bring her passion and be a part of such a wonderful organization.

Ashleigh Little 

Cell: 864-309-9172

Takicia Otero, Case Manager, is originally from New Jersey but moved to SC in 2006.  She has served children with special needs for over 20 years.  Her passion for helping children and their families led her to pursuing her B.S. in Sociology and she graduated from Coker University. Takicia previously worked as a Case Manager with the Department of Social Services.  She is excited about joining the Arc of SC and using her life to advocate for and support children and families who have been touched by Intellectual and Developmental Disabilities.  

Takicia Otero

Cell: 803-665-0431


Dyan Clary, case manager, joined The Arc of South Carolina in September of 2020.  She graduated from Lander University with a BS degree in psychology.  Dyan has always had a heart for helping others.  At 14 years old while she was teaching her uncle the alphabet, she discovered her passion in working with people who have special needs.  Dyan has many years of experience in direct care. case management, and also supervisory roles in the residential community throughout the SC Department of Disabilities and Special Needs  She is also passionate about her family, books, music, and the beach.

Dyan Clary

Cell: 864-341-5424

Labresha Ratchford, Case Manager, joined The Arc of South Carolina's team in April 2019.  She is a native of the Upstate area and received her bachelor's degree in business administration.  She brings 9 years of experience working with individuals with intellectual and developmental disabilities.  She is a mother of 2 beautiful children and is very excited to continue to work with families and clients of this great organization. 

Labresha Ratchford 

Cell: 864-559-0632

Connie Brown, Case Manager, is originally from Normal, Illinois. She moved to Missouri and began working in student disability services at Missouri Western State University in the Adaptive Technology Department. She graduated from Missouri Western State University with a bachelor’s degree in Sociology.  After graduation, she worked with individuals who have intellectual and related disabilities who lived in the community.  She worked in a variety of capacities (direct support, house manager, coordinator positions) in residential settings, and then went into case management. Upon moving to South Carolina, she served people with disabilities in case management, quality assurance, and day program managing capacities. She is excited to work with The Arc of South Carolina and looks forward to assisting individuals in achieving their goals.

Connie Brown 

Office: 803-748-5020 ext 8#

Cell: 803-665-0424

Derek  Smoot, Case Manager, is originally from Maryland and graduated from the University of Maryland with a Bachelor's degree in Criminal Justice. He moved to Columbia in October 2018. He is excited to work with The Arc of South Carolina and looks forward to assisting individuals and families in achieving their goals.

Derek Smoot 

Office: 803-748-5020 ext 6#

Cell: 803-431-5405 


Mikayla White, Case Manager, joined the Arc of South Carolina in September 2020. Mikayla holds a Bachelors of Science in Human Development and Family Studies from the University of Vermont. Originally from Vermont, Mikayla and her husband moved to Myrtle Beach, South Carolina in 2018. She holds a passion for finding creative solutions to help and support families and is excited to work with individuals across the life span. 

Mikayla White 

Cell: 843-940-0994


Bryan Antonoff, Case Manager, was born and raised in New York where he attended St. Joseph's College and obtained a dual Bachelor's degree in Psychology and Speech Communications. His love of working with people with special needs stems from his lifelong support of his twin brother who is on the Autism Spectrum. Bryan had experience as a Direct Support Professional, a Behavior Technician, a Residential Manager, and a Case Manager prior to moving to South Carolina. Bryan is excited to jump back into Case Management with the Arc of South Carolina.

Bryan Antonoff 

Cell: 843-301-4916

Olivia Richardson, Case Manager, is originally from Rock Hill, SC but has now relocated to Beaufort, SC. She graduated in May 2019 from the University of South Carolina- Beaufort with a Bachelor in Science in Human Services. Before coming to the Arc of South Carolina in August 2019, Olivia worked as a Camp Counselor at a summer camp for all aged individuals with disabilities for four years. She shares a passion of advocacy and is a strong believer that a strong foundation in life promises success. Olivia is excited to share her passion and become apart of the Arc Family

Olivia Richardson 

Cell: 843-301-1580

McCall Rice, Case Manager, grew up in Asheville, North Carolina and obtained her Bachelor's Degree in Social Work at the University of South Carolina in Columbia. McCall's personal passion for advocacy started at a young age, advocating and providing support for her friends and family members with intellectual and developmental disabilities. McCall was a camp counselor at First Shine, an overnight and day camp for children and young adults with disabilities, for four years and eventually assumed the role as Camp Director. McCall interned at the Arc of South Carolina for two years and joined the staff as full time in May of 2020.

McCall Rice 

Cell: 843-252-1015


 I was born and raised in Puerto Rico. I have lived in New York, Connecticut, Virginia, Germany, South Carolina and Georgia. Earned  my B. S. in Psychology, from Columbia Southern University. My personal passion is to help parents that have kids with a new diagnosis understand the diagnosis and learn what resources are available to support them.  I have always worked in a people services industry and since having my son who is now 9 yrs old and have a diagnosis of Autism, Type 1 diabetes and ADHD. 

Abby Rivera 

Cell: 803-665-0504






Latonya Ross, case manager, is a lifelong resident of South Carolina and graduated from Anderson University with a Bachelor's degree in Human Services. Her passion is helping individuals and families improve their overall quality of life. She is excited to have the opportunity to work with The Arc of SC and continue helping others believe and achieve.

Latonya Ross 

Cell: 864-340-0399

Hayden Redding, Case Manager, is originally from the northside of Greenville, has now relocated to Anderson County. Hayden received her bachelor's degree in Sociology and double minored in Child & Family Studies and Psychology at Lander Univeristy. Hayden has a passion to help individuals and families with special needs. She has history working as an Early Interventionist, at United Ministries, and volunteering with the Burton Center, which all provides her with lots of experience and resources that will be helpful as a Case Manager at The Arc of SC.

Hayden Redding 

Cell: 864-202-8655


Coming Soon

Darcie Weiser 

Cell: 803-665-0196


Jasmaine Hughes Miller, Case Manager, is a native of Cowpens, South Carolina. She graduated from the South Carolina State University where she received a Bachelor's degree in Family and Consumer Services/Business. Jasmaine has worked with individuals with special needs and disabilities for the last seven years. She is passionate about her work, her husband and her family. 

Jasmaine Hughes 

Cell: 864-772-9125


Hi all! My name is Shay King-Dunson, and I grew up in upstate South Carolina. After completing my undergraduate studies at Columbia College in Accounting and English, I delved into the world of finance, serving as a banker and junior accountant. As time passed, I began to realize that my passion was no longer in finance, but instead in directly helping people. Having a younger brother with Autism, I have always been inclined to try my best to thoroughly understand individuals with disabilities and the many things that improve their overall quality of life. I am excited to be a part of The Arc of South Carolina, serving as an advocate as well as a friend to the individuals I serve as I take strides to ensure they have the things they need to thrive, progress, and be happy within their lives!

Shay King-Dunson 

Cell: 803-665-0563