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)