Holder of a law degree, a doctorate certificate of examination in intellectual property and having passed the bar exam, Blaise Grosjean worked as a lawyer in the intellectual property department of the Information Horlogère Suisse.

He was then a partner with the firm of Cornu Châtelain Tissot Grosjean in La Chaux-de-Fonds, and later joined as a partner two firms in Geneva (Pugnat et Grosjean then Pfyffer and associates). He became a partner in the firm in 1996.

Since 1996, he has served as substitute judge at the Geneva Court of Justice.

He is a member of the Geneva Bar Association, the Association Suisse des Juristes, Association Genevoise de Droit des Affaires and AROPI (Association Romande pour la Propriété Intellectuelle).

Blaise Grosjean dedicates his activity to civil and commercial litigation.