Cothran was selected earlier this year on January 12 as the interim Commissioner for District 8.
Previously he served 23 years in the military and 15 years in the civilian sector as a medical noncommissioned officer (NCO), Sergent Major of the 10th Mountain Division-Fort Drum in New York, and a principal at Mound Street Academies.
Blake is a Shreveport native and graduate of Louisiana Technical College Barber Program and the owner of Avalon Hair Salon for 25 years.
Blake was sworn in by Caddo Parish Clerk of Court Mike Spence. The term filled by Blake ends January 7.
According to the Parish Commission, a commissioner is appointed to enact ordinances, set policy and establish programs in such fields as criminal and juvenile justice, highways and streets, sanitation, planning and zoning, public health and welfare, libraries, culture and recreational facilities, economic development and general administrative services.