English language certifications (passed examinations):

• Cambridge Business English Certificate Higher - CEFR-Level C1 (June 2007).
• Cambridge ESOL Certificate of Proficiency in English - CEFR-Level C2 (June 2004).
• Cambridge ESOL Certificate in Advanced English - CEFR-Level C1 (June 2003).
• Cambridge First Certificate in English - CEFR-Level B2 (June 2002).
• Certificate Technical English (University of Applied Sciences Frankfurt) (May 2002).

Chinese language certifications (passed examinations):

• Certificate after participation in 2-week intensive Chinese language course at the Landesspracheninstitut (Sinicum) of the Ruhr-University in Bochum (August 2011).
• Chinese Proficiency Test, HSK Level 4 - CEFR-Level B2 (October 2010).
• Chinese Proficiency Test, HSK Level 3 - CEFR-Level B1 (May 2010).
• Chinese Proficiency Test, HSK Level 2 - CEFR-Level A2 (May 2010).
• Certificate after participation in 4-week intensive Chinese language course at the International School of the Tongji University in Shanghai, China (October-November 2008).
• Certificate after participation in 3-week intensive Chinese language course at the International Chinese Language Institute of the Shaanxi Normal University in Xi'an, China (July 2005).

Hungarian language certifications (passed examinations):

• Certificate after participation in Intermediate Hungarian Language Course for 1 semester at the Budapest University of Technology and Economics, Hungary (January 2005).
• Certificate after participation in 4-week Hungarian Language and Culture Summer School at the International Studies Centre of the University of Pécs in Hungary, including an intensive language course in basic Hungarian (August 2004).