Two studies composed by

Israel Abramovich (Abraham) Schiffmann

(Russia / Odessa, 27.9.1903 - 29.4.1930, Romania)

He was mainly a Problem composer, but also created a few Endgamestudies.

At the german wikipedia you may read more about him.

Many of his problem compositions can be found here.

 In 1963 a book was issued by Gabriel Baumgartner with his best compositions.

 

At ChesscomposersBlogspot we can read that he was a Romanian composer:

In spite of his regrettably short composing career from 1924 to 1930,

Israel Schiffmann is well remembered for his numerous strategic twomovers and for the eponymous theme.
Schiffmann defense: Black self pins a piece which would be unpinned after the threat.
Israel Schiffmann was the twomover columnist of the "Revista Română de Şah".

Odette Vollenweider compiled most of his work in 1963 in the famous "Faszinierendes Schachproblem: Kompositionen von I. A. Schiffmann".

 

(All his studies, more exact dates, possible corrections or cooks and exact details about sources can be found in the

Harold van der Heijden (HHdbVI))