The chief executive of Gundersen Health System in La Crosse says it's never good when a CEO stays too long. So, with that in mind, Dr. Jeff Thompson says he'll be leaving the post when a replacement is found. The 62-year-old Thompson has been CEO of Gundersen since 2001 and vice president from 1995 to 2001. The La Crosse Tribune reports Thompson played a key role in negotiating a merging Gundersen Clinic with Lutheran Hospital in 1996. Gundersen Health System is the largest employer in La Crosse with 6,300 workers.