Mooney has worked for the Hattiesburg Fire Department since 1997. In that time, he has acquired more than 1,200 hours of certifications and training. He was promoted to the rank of battalion chief in 2016 and was appointed fire marshal.
At Tuesday's meeting, Mooney thanked city leaders for the opportunity to serve Hattiesburg in the capacity.
Barker said his administration is working hard to find a permanent fire chief replacement. A news release from the city said Mooney is not a candidate for the permanent position.