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Gregory A. Campbell, Ph.D., is Chief Technical Officer at Castle Associates, Jonesport, ME. He was previously professor and departmental chair of chemical engineeering at Clarkson University, NY. He formerly directed a research group at GM Research and managed polymer fabrication at Mobil Chemical Research. He is a Fellow and former Extrusion Board Member of the Society of Plastics Engineers (SPE).

Mark Spalding, Ph.D., is a Fellow in the Materials & Parts Processing Group at The Dow Chemical Company, where he has worked since 1985. He has held a number of technical positions in Corporate R&D, Polystyrene R&D, Plastics R&D, and INCLOSIA* Solutions. He is a Fellow and an Honored Service Member of the Society of Plastics Engineers.

About the Author

Gregory A. Campbell, Ph.D., is Chief Technical Officer at Castle Associates, Jonesport, ME. He was previously professor and departmental chair of chemical engineeering at Clarkson University, NY. He formerly directed a research group at GM Research and managed polymer fabrication at Mobil Chemical Research. He is a Fellow and former Extrusion Board Member of the Society of Plastics Engineers (SPE) Mark Spalding, Ph.D., is a Fellow in the Materials & Parts Processing Group at The Dow Chemical Company, where he has worked since 1985. He has held a number of technical positions in Corporate R&D, Polystyrene R&D, Plastics R&D, and INCLOSIA* Solutions. He is a Fellow and an Honored Service Member of the Society of Plastics Engineers.