Management Team

Douglas T. Dietrich
Chief Executive Officer​

 

D.J. Monagle, III
Group President, 
Specialty Minerals and 
Refractories

 

Matthew E. Garth
Senior Vice President,
Finance and Treasury,
and Chief Financial Officer

 

Jonathan J. Hastings
Group President, 
Performance Materials

 

Douglas W. Mayger
Senior Vice President and Director, ​​MTI Supply Chain​

 

Thomas J. Meek
Senior Vice President, General Counsel, Secretary and Chief Compliance Officer Vice President Human Resources

 

Brett Argirakis
Vice President and Managing Director, 
Minteq International Inc.

 

Andrew M. Jones
Vice President and Managing Director
Energy Services​