Harold E "Harry" Yohn serves as Product Applications Specialist for Tinius Olsen Testing Machine Co. in Horsham, Pa. Harry has been with the company since 1996. He has 19 years of experience in the field of mechanical and physical testing of plastics.

In 1990, Harry became a member of ASTM International Committee D20 on Plastics, and he is now a vice chair of the committee (methods), a group of about 700 members responsible for 473 standards. He is also Subcommittee chairman for D20.30 on Thermal Properties of Plastics and chair of D20.10 Impact Properties as well as chair of several task groups within the committee. Harry has been honored with an Award of Appreciation in 1998 and an Award of Recognition in 2004.

In addition to his D20 work, Harry participates in standards development through the International Organization for Standardization (ISO). He is currently part of the U.S. delegation to ISO/TC61

Harry is a 1983 graduate of the Pennsylvania State University. Before joining Tinius Olsen, he served as sales engineer and then sales manager for Custom Scientific Instruments, Inc. a division of Atlas Electric Devices Co of Chicago.