 AUSTIN, Texas--BUSINESS WIRE--Hyliion Holdings Corp. NYSE: HYLN Hyliion, a leader in electrified powertrain solutions for Class 8 semi-trucks, today announced that the Honorable Elaine Chao will join its board of directors. A highly experienced leader of large public, private and non-profit organizations, Elaine Chao brings an invaluable perspective on global competitiveness, workforce development, trends in governmental policies, and corporate governance. While Secretary of Transportat 