Technical/audio career began when had to leave doctoral program at UCLA to fulfill military obligation.  Did this in 2 phases first with the Air Force as General Electric contractor as radar specialist at remote Alaska base.  Transferred in 1968 to GE program with NASA and began using electronics background in computer maintenance on the large mainframes of the time.  Upon completion of military obligation did freelance maintenance for the large recording studios and movie lots such as Fox in the Los Angeles/Hollywood area.  Over the next 25 years became more focused on speaker work and developing own line of speakers.  Met Dr Bruce Edgar in  1998 and developed a  collaboration of his tractrix horns and my field coil drivers. These products were integrated into several high end product lines leading to interest by Brush/Materion in taking their beryllium domes and developing a finished diaphragm for the pro market.  That project was completed by 2011.  Now simi-retired  was talked into again doing a challenging product development by David Dai  leading up to the forming of ESD.  Life member of Audio Engineering Society AES, and Society of Motion Picture and Television Engineers SMPTE.

Dr. Guichao Hua had his Ph. D of Electronic Engineering at Virginia Polytechnic Institute and State University, and is a world-class expert in the field of switch mode power supply.

In 1994, he along with the director of CRES research center Fred.C. Lee founded VPT company, which has become the world's largest supplier of military switch mode power supply. 

In 2007 he founded Inventronics (Hangzhou) Inc. which has gone public in 2016.

He joined ESD Acoustic in 2017, aiming to apply switch mode power supplies in the speaker industry. The technology has been successfully applied in ESD’s amplifiers, field coil power supplies, central intelligent sequencers etc. It eliminates the disturbance from the power grid, securing the transient response and fidelity of the system.