Rudolf Tschäni is regarded as a leading legal advisor to companies. Chambers Global and Chambers Europe recognized Rudolf Tschäni as the only "Star Individual" in Switzerland during many years and quote him as "a brilliant lawyer with an enormous track record". In its 2021 edition, Chambers Global and Chambers Europe characterize him as a "strategic mastermind". Who is Who Legal Switzerland names him a "superstar in M&A" and in 2020 granted him the Lifetime Achievement Award for M&A and corporate governance. Further, in the 2021 edition of Who is Who Rudolf Tschäni is singled out among peers as a leading light for governance issues in Switzerland. In the 2020 edition of Best Lawyers and Handelsblatt he is recognized as "Lawyer of the Year" for his work in Mergers & Acquisitions Law. Apart from advising on transactions generally, he concentrates on advising the board and management in takeover and stress situations as well as generally in the area of corporate governance. Furthermore, he has extensive experience as board member and is often nominated as arbitrator in national and international arbitration procedures, in particular in disputes relating to mergers and acquisitions.