Contact Information

GMW Associates

955 Industrial Road
San Carlos, California 94070, USA

Main Phone:  +1 (650) 802-8292
Fax:  +1 (650) 802-8298

Our location

From SFO:

Take 101 south from SFO and exit on Holly street. Turn left onto Industrial road. GMW will be on the left side after about ¾ths of a mile.

From SJC:

Take 101 north from SJC and exit on Whipple avenue. Turn right onto Industrial road. GMW will be on the right side about 1 ½ miles up.

Click here for directions to GMW Associates from Google Maps

Who to Contact

Sales and Customer Support

Brian Richter
Brian Richter
Sales and Customer Support
Tel (direct): +1 (650) 200-4734
Ludo Letourneur Headshot
Ludovic Letourneur, PhD
Senior Applications Engineer
Magnetic Field Instrumentation
Tel (direct): +1 (650) 282-2340
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Simone Sexton
Sales Assistant
Sales and Order/RMA Status
Tel (direct): +1 (650) 200-4735

Engineering and Technical Support

Ian Walker
Senior Applications Engineer
Technical Support for Sensors, Instruments, Magnetic Mappers and Magneto-Optic Sensors
Tel (direct): +1 (650) 240-1134
Yuqiang Qin
Yuqiang Qin
Senior Applications Engineer
Technical Support for Electromagnet Systems, Group3 Control, LabVIEW application software and Magnet Power Supplies
Tel (direct): +1 (650) 282-2344
Tom King, PhD
Lead Magnet Scientist
Technical Support for Electromagnets and Systems
Tel (direct): +1 (650) 282-2339
Filippos Toufexis, PhD
Applications Engineer
Tel (direct): +1 (650) 282-2335
Cerwyn Chiew
Project Engineer, Magnets & Magnet Systems
Tel (direct): +1 (650) 674-4551
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Sandro Renteria
Calibration Lab Manager
Calibration and repair of magnetic field measuring products and current transducers
Tel (direct): +1 (650) 200-4740

Operations and Accounting

Lalo Guitron
Senior Vice President, Operations
Tel (direct): +1 (650) 200-4737
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Dan Vlkovic
Manager of Accounting and Finance
Tel (direct): +1 (650) 282-2338
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Jessica Chang
Staff Accountant
Accounts Payable & Accounts Receivable
Tel (direct): +1 (650) 282-2337


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Ben Hartzell
Senior Vice President, Marketing
Tel (direct): +1 (650) 200-4736

How to obtain an RMA (Return Material Authorization)

Many faults can be diagnosed and corrected over the phone. If you have not tried this, please contact the most appropriate person on the list above for assistance.

If the fault can not be corrected with the help of telephone support, please email for an RMA number. We will setup an RMA and provide instructions on shipping, as well as in some cases be able to give an estimate of repairs before you return the product.