Siegen Branch
FOS Inon Optics GmbH
Eiserfelder Straße 316
D-57080 Siegen
Office Times
| Monday to Thursday | 09.00 – 13.00 14.00 – 19.00 |
| Friday | 09.00 – 14.00 |
Point of Contact
Georg Kessler
Managing Director, Partner, Commercial Management, Sales
+49 (0) 271 3875 1340
gkessler@fosinon.com
Melanie Kessler
+49 (0) 271 3875 1340 ext. 16
mkessler@fosinon.com
Tatjana Jeckel
Administration
+49 (0) 271 3875 1340 ext. 12
tjeckel@fosinon.com
Asslar Branch
FOS Inon Optics Asslar GmbH
Herborner Straße 61
D-35614 Aßlar
Office Times
| Monday to Thursday | 09.00 – 13.00 14.00 – 19.00 |
| Friday | 09.00 – 14.00 |
Point of Contact
Georg Kessler
Managing Director, Partner, Commercial Management, Sales
T +49 (0) 6441 210 169-0
gkessler@fosinon.com
Andreas Gebert
Technician / Occupational Safety, Production
M +49 (0) 151 42241174
T +49 (0) 6441 210 169-11
agebert@fosinon.com
Markus Fink
Quality Management
T +49 (0) 6441 210 169-16
mfink@fosinon.com
Claudia Hildebrand
Office Manager
M +49 (0) 151 42241191
T +49 (0) 6441 210 169-13
childebrand@fosinon.com
General Enquiries
Contact Form
Georg Kessler
Geschäftsführer, Gesellschafter
Kaufmännische Leitung,
Vertrieb
T +49 (0) 6441 210169-10
gkessler@fosoptics.de
Thomas Pfeifer
Dipl.-Ing (FH)
Geschäftsführer, Technische Leitung, Vertrieb, Fertigung
M +49 (0) 151 42241191
T +49 (0) 6441 210169-12
tpfeifer@fosoptics.com
Andreas Gebert
Technik / Arbeitssicherheit, Fertigung
M +49 (0) 151 42241174
T +49 (0) 6441 210169-11
agebert@fosoptics.com
Reliability doesn’t happen by chance.
At FOS Inon Optics, quality is not just a promise—it is a standard that can be measured. Our development and manufacturing processes for fiber-optic systems are ISO 9001:2015 certified. This establishes the foundation for reliable performance, reproducible results, and trust wherever optical precision is critical.
