Monique Williams is an Accountant with over 20 years of experience in nonprofit and governmental accounting.

Monique received her Bachelors of Business Administration majoring in Accounting and Masters of Professional Accountancy specializing in Accounting Information Systems from Georgia State University. She was the Director of Finance at Public Broadcasting for 13 years, and she successfully improved financial operations by introducing effective internal control, processes, and standards.

Monique is a native Georgian who loves the Atlanta Falcons.

Tonya Boose is the Director of Residential Services, and she provides programmatic support for the Veterans Program, Evolution Center, Caroline’s Kitchen, & the Engagement Center at Gateway Center. She provides leadership, support, and guidance for all the programs she oversees. Tonya earned her BS in Marketing from York College and her MPA from Metropolitan College of New York. In 2000, after volunteering to help high-risk youths, Tonya became interested in the field of Social Services. In 2001, she began work as a Case Manager for The Salvation Army Jamaica Women’s Triage and Referral Shelter, ultimately becoming its Director of Social Services. In 2006, Tonya and her family moved to Georgia where she continued her passion for social service, and she joined the team at Gateway Center.

Greg Callihan is a life-long Georgian who has been involved in facilities maintenance for almost 20 years. He began working part-time in the apartment industry doing light maintenance work while on his spring and summer breaks from college. This part-time work led to his first experience working with persons just coming out of homelessness at The Welcome House. Greg spent over five years working at Welcome House, and became the Service Manager there -leading a team of maintenance and housekeeping employees. His experience there –working with people who had just gotten housing after living on the streets- created a desire to work more directly with people who were still homeless.

Greg became the Maintenance Director of The ROCK, a homeless resource center in downtown Atlanta. He held this position until The ROCK merged into The Gateway Center in July 2005. Greg has been working at Gateway since before the doors opened for clients –he directed numerous teams in coordinating furniture donations and deliveries prior to Gateways grand opening. He has held the same position at Gateway while working for three companies –first through PCCI, then part of the Ohio Equities team, and finally as a Gateway employee starting in August 2009.

While in college, Greg was pursuing a degree in Biblical Studies with a specialization in missions. Although he is not a missionary in any standard sense of the word, Greg views his work as part of the mission field. He enjoys his role as behind-the-scenes support for the incredible staff at The Gateway Center.