Aehr Test Systems announced the appointment of Chris Siu as the Company's Executive Vice President of Finance, He will succeed Ken Spink, who previously announced his planned retirement after 15 years with the Company. Mr. Spink will stay on through the completion of Aehr's fiscal 2023 year that ends May 31, 2023 and annual 10-K filing to ensure an orderly transition. Mr. Siu brings more than 27 years of finance and accounting experience in the semiconductor, medical equipment, and public accounting industries.

Before joining Aehr Test Systems, he most recently served four years in senior finance executive positions at publicly traded Ultra Clean Technologies, a global leading developer and supplier of critical subsystems, components and parts, and ultra-high purity clean and analytical services primarily for the semiconductor and semiconductor equipment industry, including Senior Vice President of Finance, Corporate Treasurer, and Chief Accounting Officer. Prior to Ultra Clean Technologies, Mr. Siu held senior management roles at PDF Solutions and also GlobalFoundries, a multinational semiconductor manufacturing company, where he served for eight years including leading all global accounting functions as Corporate Controller for four years. He was also Chief Accounting Officer and Director of Finance at semiconductor company Trident Microsystems and served in several senior finance management positions at medical device and software manufacturer Varian Medical Systems. Mr. Siu also worked three years with Deloitte and left as an Audit Manager, and began his career in public accounting serving over five years with EY.

He is a Certified Public Accountant (inactive) in California. Mr. Siu holds a Bachelor of Science degree in Accounting from Brigham Young University in Hawaii and a Master of Business Administration degree from the University of California at Berkeley.