About Us

Locations

Cornerstone's headquarters is in Middletown, New York. We serve clients across the U.S. from a network of regional offices.

 

Regional Offices

Arizona

17 W. Wetmore Road, Suite 310
Tucson, AZ 85705
Toll Free: (877) 633-5520
Fax: (520) 888-4804
Contact: Garth Bowers

California

7600 Dublin Boulevard, Suite 200
Dublin, CA 94568
Toll Free: (877) 633-5520
Fax: (925) 560-9879
Contact: Paul Stout

Florida (Tetra Tech)

201 East Pine Street, Suite 1000
Orlando, FL 32801
(352) 275-7381
Contact: Don Hullings

Illinois

4200 Cantera Drive, Suite 102
Warrenville, IL 60555
Toll Free: (877) 633-5520
Fax: (630) 791-9003
Contact: Chris Peters

Kentucky

2456 Fortune Drive, Suite 170
Lexington, KY 40509
Toll Free: (877) 633.5520
Contact: Kari Wallover

Michigan

39395 W. Twelve Mile Road  Suite 103
Farmington Hills, MI 48331
Toll Free: (877) 633-5520
Fax: (248) 994-5456
Contact: Steve Wintheiser

New Jersey

754 Route 18, Suite 104
East Brunswick, NJ 08816
Toll Free: (877) 294-9070
Fax: (845) 692-5894
Contact: Arie Kremen

New York

100 Crystal Run Road, Suite 101
Middletown, NY 10941
Toll Free: (877) 294-9070
Phone: (845) 695-0200
Fax: (845) 692-5894
Contact: Mark Swyka

1200 Scottsville Road
Building C, Suite 320
Rochester, New York 14624
Toll Free: (877) 294-9070
Fax: (585) 563-6582
Contact: Rob Holmes

Tetra Tech Office:

5 Hanover Square, Suite 502
New York, NY 10004
Phone: (646) 576-4032
Contact: Laura Hammerer

 

North Carolina (Tetra Tech)

1 Park Drive, Suite 200
PO Box 14409
Research Triangle Park, NC 27709
(919) 485-8278
Contact: Danielle Kirk

Ohio

10012 International Boulevard
Cincinnati, OH 45246
Toll Free: (877) 633-5520
Fax: (513) 870-0610
Contact: Julie Hall

Oregon

7820 NE Holman St., Suite B-6
Portland, OR 97218
Office: (630)-410-7212
Contact: Jessica Bernardini

Wisconsin

8413 Excelsior Drive, Suite 160
Madison, WI 53717
Toll Free: (877) 294-9070
Contact: John Oswald

435 East Mill Street, Suite 15
Plymouth, WI 53073
Office: (920) 892-7643
Fax: (920) 893-9430
Contact: John Oswald

Satellite Offices

Illinois

Springfield, IL
(630) 633-5812
Contact: Rachelle Maxheimer

Kansas

Shawnee, Kansas
(630) 633-5847
Contact: Chris Eaton

Massachusetts

Reading, MA
(845) 695-0233
Contact: Scott Miller

Missouri

Kansas City, Missouri
(816) 412-1778
Contact: Mick Cossairt

St. Louis, MO
(877) 633-5520
Contact: Jared Romaine

New York

Hudson Falls, NY
(845) 695-0221
Contact: Ed Valis

Pennsylvania

Pittsburgh, PA
(877) 294-9070
Contact: Ben Furrick, Mike Contestabile

Tennessee

Memphis, TN
(630) 633-5809
Contact: Maria Brown

Washington

Spokane, WA
(630) 633-5807
Contact: Mark Case

 

 


All professional engineering work is performed by duly licensed professional engineers under the appropriate state-registered professional entity. Representations made on the website using the names Cornerstone, Cornerstone Environmental or Cornerstone Environmental Group are for marketing purposes only. 

 

Entity names are as follows:

  • Cornerstone Engineering and Land Surveying, PLLC (NY)
  • Cornerstone Engineering Group LLC (CT)
  • CEG Engineering, PLLC (NC)