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Bureaux

Pays Bas

Leon Borst

Associé

Monnikevenne 62 1141 RL Monnickendam
+31 6 26 16 06 38
lb@challengelearning.com

France

Marie Antoinette Orsini

Associé

797 Rue de la Faucille, 01173 Gex
+33 4 50 42 32 43
mao@challengelearning.com

Allemagne

Markus Gebhardt

Associé

Birkenweg 1 92253 Schnaittenbach
+49 96 22 71 86 40
mg@challengelearning.com

Suisse

Beate Vetter

Associé


Ch. Lugny les Charolles 11, 1031 Mex
+41 79 322 58 35
beate.vetter@challengelearning.com

USA

Bill Daniels

Associé


6386 Warriors run, Littleton, CO 80125
+1 303 932 8565
bd@challengelearning.com

Italie

Guido Paolo Ridoni &
Dan Wiesenfeld

Associés

Via Pateras 21, 00153 Roma
+39 33 85 07 34 39
+39 33 58 25 50 18
gr@challengelearning.com; dw@challengelearning.com

Australie

Simon Coles

Associé

70 Central Road Avalon Beach NSW 2107, 2107 Sydney
+61 452 406 319
sc@challengelearning.com

Thaïlande

Matthias Abold

Associé

Chumphon / Thailand
+66 84-872-5280
am@challengelearning.com