​ The Purchasing Agent is an appointed official with a two-year term. The Purchasing Agent, in accordance with state statutes, is appointed and reports to a five member Purchasing Board consisting of three District Judges and two County Commissioners. Effective Oct. 1, 2020, Michelle Charnoski holds the office as the Purchasing Agent for Collin County. Ms. Charnoski has 21 years of procurement experience and holds her certification as a NIGP-CPP (NIGP Certified Procurement Professional) and CPPB (Certified Public Purchasing Buyer).

The Purchasing Agent of Collin County directs a nineteen member centralized county purchasing division and is charged with the responsibility for all contracting and for the purchase of all supplies, materials, equipment for county use. In addition, the Purchasing Agent maintains surplus property and conducts public auctions for the disposition of county salvage and surplus by order of the Commissioners Court.

The Collin County Purchasing division consists of an authorized staff as follows:

• Purchasing Agent (1)​
  
• Assistant Purchasing Agent (1)
• Purchasing Analyst (1)
  
• Senior Buyer (4)
  
• Buyer II (5)
• Buyer I (3)
  
• Asset Management Technician (2)
• Purchasing Administrator (1)
• Buyer Assistant (1)