MKS Instruments (MKSI) 8-K Departure of Directors or Certain Officers

Exhibit 99.1

Summary of 2010 Salaries of Named Executive Officers*

Executive Officer	Annual Salary
Leo Berlinghieri, Chief Executive Officer and President	$	575,000
Seth H. Bagshaw, Vice President and Chief Financial Officer	$	275,000
Gerald G. Colella, Vice President, Chief Operating Officer and Acting Group VP, PRG Products	$	400,000
John T.C. Lee, Group Vice President CIT Products	$	300,000
John A. Smith, Vice President and Chief Technology Officer	$	295,000
Ronald C. Weigner, Vice President of Finance and Treasurer	$	275,000

*Includes Seth H. Bagshaw, who became Chief Financial Officer on January 1, 2010