Currently, Vassilios Zarkalis occupies the position of Chairman & Group Chief Operating Officer at Separation Technologies, Inc. and Group Chief Operating Officer & Executive Director at Titan Cement International SA, Chief Executive Officer of Titan America LLC (a subsidiary of Titan Cement International SA).

In his past career Mr. Zarkalis was Executive Director & Director-USA Region at Titan Cement Co. SA, Director-Specialty Plastics & Elastomers at The Dow Chemical Co. and Vice President of Dow Automotive.

Mr. Zarkalis received an undergraduate degree from National Technical University of Athens and a graduate degree from The Pennsylvania State University.