Since 1959, PSI has been supplying premier contracting services throughout Southern California. We are proud to be 100% emplo ... yee-owned and to have strong ties with our union. Every member of the PSI team is trained, respected, and supported by our firm, making us one of the most successful and reputable interior contractors in the industry. We work in a range of industries and are the first choice for many general contractors and end-user clients. read more