Janne is the head of Attorneys at law Borenius' tax group. He advises on matters related to corporate and cross-border taxation as well as mergers and acquisitions. Janne is ranked as a leading tax lawyer in Finland. Prior to joining Attorneys at law Borenius, Janne worked as a Tax Adviser at the auditing company KPMG and in the Ministry of Finance where his responsibilities regarded the drafting of the tax legislation. Janne is a Doctor of Laws and he defended his doctoral thesis on international tax law in 1998. He has written books on tax law and published several articles in Finnish and international publications of the field. He is one of the authors of Corporate taxation I-II (Yritysverotus I-II) (SanomaPro).