LAS VEGAS, Nov. 18 /PRNewswire-FirstCall/ -- Southwest Gas Corporation (NYSE: SWX - News) announced the retirement of Dudley J. Sondeno (Senior Vice President/Chief Knowledge and Technology Officer) effective December 31, 2009. Mr. Sondeno began his career with the Company in 1980 as a Senior Transmission Planning Engineer. He became an officer (Vice President/Engineering and Operations Support) in 1989 and was promoted to Senior Vice President/Staff Operations in 1993 before assuming his current role as Senior Vice President/Chief Knowledge and Technology Officer. The Company did not name a replacement for Mr. Sondeno and indicated that his responsibilities would be distributed among other officers of the Company.