Dr. Guo Ge (Allen Guo) is Tiertime's general manager, leading its strategic planning, technological innovation and product development since 2003.

Dr. Guo began his career at as the general manager and R&D lead of Beijing Yinhua Laser Rapid Prototyping and Mould Technology Co., Ltd. Developing Inspire series of industrial 3D printers. As the company evolved and became Tiertime, Dr. Guo led the R&D team to shift the company's technology to suit the consumer market and created its first desktop printer, which resulted in the introduction of the UP 3D Printer. His work developing the UP 3D Printer allowed Tiertime to expand into the global market, which now makes up a major part of Tiertime's sales. Under Dr. Guo's leadership, the R&D team continues to make technological and product innovations in the desktop 3D printer arena. In October 2010, Tiertime introduced the UP mini to the overseas market and in May 2013, the UP Plus 2, an update of the UP Plus, was launched globally.

Dr. Guo Ge obtained a Bachelor of Engineering from the Department of Mechanical Engineering of Tsinghua University in 1997 and received his PhD in 2002. During his PhD study, Dr. Guo focus on the research of Rapid Prototyping Control Systems and Process Planning under the supervision of Professor Yan Yongnian. Also during this period his “multi-rapid prototyping manufacturing system” project won the 2nd place National Science and Technology Progress Award and he was given the 1st place Beijing Science and Technology Progress Award.