In Černovice, Czech Republic, he finished high school and graduated from the Faculty of Law.

In the mid 1900, due to financial difficulties, Eisner moved to Bosnia and Herzegovina, where he worked at the Travnik, Jajce, Prijedor and Ključ courts of law.

All the major legislative drafts of that time (especially those in the field of civil law) passed his control and in large part are the result of his work.

After the war he worked as a member of the committees in charge with the production of a series of important legislative proposals.

[2] As an accomplished scientist, Eisner enjoyed the undivided respect of his colleagues, admirers and students.