Point of Contacts

Brian A. Schumacher
Branch Chief
(702) 798-2242
(702) 798-2107 fax
schumacher.brian@epa.gov

Steven P. Gardner
Geologist
(702) 798-2580
(702) 798-2107 fax
gardner.steve@epa.gov

D. Dale Werkema
Physical Scientist
(702) 798-2263
(702) 798-2107 fax
werkema.d@epa.gov

Stephen Billets
Research Chemist
(702) 798-2232
(702) 798-2107 fax
billets.stephen@epa.gov

Aldo T. Mazzella
Geophysicist
(702) 798-2254
(702) 798-2107 fax
mazzella.aldo@epa.gov

John H. Zimmerman
Res. Physical Scientist
(702) 798-2385
(702) 798-2107 fax
zimmerman.johnh@epa.gov

Evan J. Englund
Math Statistician
(702) 798-2248
(702) 798-2107 fax
englund.evan@epa.gov

John M. Nocerino
Research Chemist/Chemometrician
(702) 798-2110
(702) 798-2107 fax
nocerino.john@epa.gov

Katrina Varner
Research Chemist
(702) 798-2645
(702) 798-2107 fax
varner.katrina@epa.gov