Yukie Natori：
Dean of Tokyo Imperial Nail School (JNA Headquarters Accredited School)
New York Hair Salon Manicure, Owner of HEARTS NEW YORK SALON & YUKIE BEAUTY SPA
JNA Permanent Headquarters Certified Lecturer
JNA Certified Lecturer Examination Officer
Chairman of Education Committee of JNA International Nail Technician Appraisal Test
Examination Officer Leader of JNEC Appraisal Exam Level 1, Level 2 and Level 3
JNA Gel Appraisal Exam（Junior, intermediate, and advanced）
JNA certified health management instructor
Judges and Executive Committee of JNA Nail Contest
Executive Committee Member of Tokyo Nail Expo hosted by JNA
Nakaya Rumiko：
Certified Lecturer of the Permanent Headquarters of Japan JNA Association
Japan JNEC Examination Officer
Former professor of PRESTO phototherapy gel product development department
Former professor of product development department of Nail de Dance
Crystal lecturer of Nail de Dance
Lecturer of Salon Hygiene Manager Guidance