EPA Region 1
5 Post Office Square - Suite 100
Boston, MA 02109-3912

Leiran Biton
(Permit and SIP Modeling)
biton.leiran@epa.gov
(617) 918-1267 FAX: (617) 918-0267

EPA Region 2
290 Broadway
25th Floor
New York, NY 10007-1866

Annamaria Colecchia
(Permit Modeling, Environmental Justice)
colecchia.annamaria@epa.gov
(212) 637-4016 FAX: (212) 637-3901

Neha Sareen
(Permit/Photochemical Modeling)
sareen.neha@epa.gov
(212) 637-4074 FAX: (212) 637-3901

EPA Region 3
1650 Arch Street
Philadelphia, PA 19103-2029

Tim Leon-Guerrero
(Permit/SIP Modeling)
leon-guerrero.tim@epa.gov
(215) 814-2192 FAX: (215) 814-2124

Howard Schmidt
(Permit Modeling)
schmidt.howard@epa.gov
(215) 814-2133 FAX: (215) 814-2124

Todd Ellsworth
(SIP Modeling)
ellsworth.todd@epa.gov
(215) 814-2195 FAX: (215) 814-2124

EPA Region 4
Sam Nunn Atlanta Federal Center
61 Forsyth Street SW
Atlanta, GA 30303-8960

Rick Gillam
(Permit/SIP Modeling)
gillam.rick@epa.gov
(404) 562-9049 FAX: (404) 562-9095

Chris Howard
(Permit/SIP Modeling)
howard.chris@epa.gov
(404) 562-9036 FAX: (404) 562-9095

Richard Monteith
(Permit Modeling)
monteith.richard@epa.gov
(404) 562-8949 FAX: (404) 562-9095

Katie Walther
(Permit/SIP Modeling)
walther.katherine@epa.gov
(404) 562-9110 FAX: (404) 562-9095

Richard Wong
(Moblie Source Modeling)
Wong.Richard@epa.gov
(404) 562-8726 FAX: (404) 562-9095

Adam Friedman
(Permit Modeling)
Friedman.Adam@epa.gov
404-562-9033

EPA Region 5
Ralph Metcalfe Federal Building
77 West Jackson Blvd.
Chicago, IL 60604-3590

Randy Robinson
(General Modeling Contact)
robinson.randall@epa.gov
(312) 353-6713

Mary Portanova
(SIP Modeling)
portanova.mary@epa.gov
(312) 353-5954

Phuong Nguyen
(Air Toxics)
nguyen.phuong@epa.gov
(312) 886-6701

Emily Crispell
(SIP Modeling)
crispell.emily@epa.gov
(312) 353-8512

Mike Langman
(Permits)
langman.michael@epa.gov
(312) 886-6867

Mike Leslie
(Mobile Sources)
leslie.michael@epa.gov
(312) 353-6680

Jenny Liljegren
(Regional/SIP Modeling)
Liljegren.Jennifer@epa.gov
(312) 886-6832

EPA Region 6
1445 Ross Avenue, Suite 1200
Dallas, Texas 75202

Erik Snyder
(General Modeling Contact)
snyder.erik@epa.gov
(214) 665-7305 FAX: (214) 665-7263

Ashley Mohr
(Permit/SIP Modeling)
mohr.ashley@epa.gov
(214) 665-7289

Michael Feldman
(Permit/SIP Modeling)
feldman.michael@epa.gov
(214) 665-9793

Robert Imhoff        
(Permit/SIP Modeling)
imhoff.robert@epa.gov
(214) 665-7262

EPA Region 7
11201 Renner Boulevard
Lenexa, Kansas 66219

Andy Hawkins
(Permit/SIP Modeling)
hawkins.andy@epa.gov
(913) 551-7179 FAX: (913) 551-9179

Lance Avey
(Permit/SIP Modeling)
avey.lance@epa.gov
(913) 551-7809

EPA Region 8
1595 Wynkoop Street
Denver, CO 80202-1129

Gail Tonnesen
(General Modeling Contact)
tonnesen.gail@epa.gov
(303) 312-6113

Rebecca Matichuk
(General Modeling Contact)
matichuk.rebecca@epa.gov
(303) 312-6867

EPA Region 9
75 Hawthorne Street
San Francisco, CA, 94105

Carol Bohnenkamp
bohnenkamp.carol@epa.gov
(415) 947-4130

Scott Bohning
bohning.scott@epa.gov
(415) 947-4127

Rynda Kay
kay.rynda@epa.gov
(415) 947-4118

EPA Region10
1200 Sixth Avenue, Suite 900
Seattle, WA 98101

Jay McAlpine
(General Modeling Contact)
mcalpine.jay@epa.gov
(206) 553-0094 FAX: (206) 553-8210

Robert Kotchenruther
(SIP Modeling)
kotchenruther.robert@epa.gov
(206) 553-6218 FAX: (206) 553-8210

Nicole Briggs
(SIP Modeling)
Briggs.Nicole@epa.gov
(206) 553-6241  FAX: (206) 553-8210