Exhibit 99.1 EMPLOYMENT AGREEMENT EMPLOYMENT AGREEMENT effective as of January 25, 2005 (Employment Agreement") by and between MKS Instruments, Inc., a Massachusetts Corporation (the "Corporation"), and Ron Hadar of Cupertino, CA (the "Employee")....Employment Agreement • March 24th, 2005 • MKS Instruments Inc • Industrial instruments for measurement, display, and control • Massachusetts
