San Diego DNA sequencing company Illumina Inc. has appointed Francis deSouza, a Bay Area computer security executive, as its president. He will join the company in December.

DeSouza will lead Ilumina’s business units and be responsible for conceptualizing, developing and producing the company’s products, Illumina (Nasdaq: ILMN) said in a statement. He will report to CEO Jay Flatley.

DeSouza is moving to Illumina from Symantec Corp., a Mountain View-based computer security company, where he was president of products and services. Prior to that, he was co-founder and CEO of IMlogic Inc., an instant messaging software maker that was acquired by Symatec (Nasdaq: SYMC) in 2006. He also was co-founder and CEO of Flash Communications, a provider of corporate instant messaging that was acquired by Microsoft Corp. (Nasdaq: MSFT) in 1998.

DeSouza is board chairman of MedHelp, a large online health community.

“Francis’ broad technology background, his experience in providing complex technology solutions, and his roles in scaling and leading both entrepreneurial startups and large enterprises make him ideal for the role,” Flatley said in a statement. “We are very excited to have Francis join our team.”

Shares for Illumina, a $12.1 billion market cap company, closed at $96.20 on Nov. 11.

— SDBJ Staff Report