Dr Graves is corporate manager of technical services at Vulcan Materials Co in Birmingham, Alabama, USA. He has been vice chairman of ASTM International Committee C09 on Concrete and Concrete Aggregates, and chairman of Subcommittee C09.95 on Coordination, and an ASTM International member since 1992.

Janikowski is technical manager at Plymouth Tube Co, a global supplier of stainless steel, and carbon and alloy tubing in East Troy, Wisconsin, USA. He currently serves as chairman of Subcommittee A01.10 on Stainless and Alloy Steel Tubular Products, and on other subcommittees in Committee A01 on Steel, Stainless Steel and Related Alloys. He is also a member of Committees B02 on Nonferrous Metals and Alloys, B07 on Light Metals and Alloys, and B10 on Reactive and Refractory Metals and Alloys.