Founder & CEO of Onion Technology, child company of Onion Software as SEA presence focusing on data center industry.Onion Technology provides unified BMS (Building Management System) + DCIM (Data Center Infrastructure Management) solution which was perfectly proven and highly acclaimed in Korean data center market more than 17 years, one of the toughest markets in the world.

Chang is the founder of Onion Software, a leading data center solution provider in Korea over 17 years. Onion Software founded in 2000, is well known in the Korean data center industry as a unified BMS (Building Management System)+DCIM to provide state-of-the-art monitoring/control/operation for data center MEP infrastructure.Most major large scale data centers including Korea Telecom, SK Telecom, LG U+, Samsung, Lotte and Posco adopted Onion's unified BMS+DCIM to maximize their data center operation efficiency.Along with 17+ years of data center experience, Chang has profound knowledge of data center construction and operation. He is a technical board member of Green Data Center Certificate which is an organization authorized by the Korean government to bestow awards upon energy efficient data centers in the country. He has been investigated PUE and architecture almost every big data center in Korea as a judge for certificate award. Recently, he joined KDCC (Korea Data Center Council) as a board member to promote the Korean data center industry.

Chang worked for HP consulting as a CRM consultant with experience with SKT, Busan Bank projects. Chang published CRM handbook representing CRM technology and strategy of HP in 2001.