After working for a major translation agency as salesperson and checker in patent translation section, Hiroshi Arai worked for a major patent office as patent translator (English & German to Japanese, chemical section), and as patent engineer for about 10 years.
- MA, German Literature, Tokyo Metoropolitan University
- BA, Fuculty of German studies, Tokyo University of foreign Studies
- Level 1 of the Patent Translation Examination sponsored by NIPTA (Nippon Intellectual Property Translation Association) in 2010 (Chemistry; English into Japanese)
- 2nd Grade Certified Specialist of Intellectual Property Management (administration) (2011) English Technical Writing Test, Grade 2 (2012)