A vast majority of his works were designed in collaboration with different Romanian architects, such as Dimitrie Maimarolu, Alexandru Savulescu and C. Cretoiu or with foreign colleagues, Aloys Pesch or Alfred Popper.
The Polish architect remains part of the capital’s history because of the emblematic building of the “Caru’ cu Bere” restaurant, a neo-gothic attraction both for the 20th century party-goers, as well as for the 21st century tourists. (Oana Marinache, 2015)
(Lemberg, Galicia, Austria-Hungary, in 1858; in 1888 he settled in Bucharest)
1872-1876 - He attended the courses of the Technical Academy in Lviv. Immediately after finishing his studies, he arrived in Romania, on Johannes Schultz’ recommendation, in order to participate in the construction of the Peles Castle in Sinaia.
1892 - "Alexandru Barbu" House, str. Popa Soare nr. 38, Bucharest, Romania;
1892 - "S. Kofcinsky" House, str. Popa Chitu nr. 3, Bucharest, Romania;
1898-1899 - "Caru’ cu bere" Restaurant, Bucharest, Romania;
1898-1901 - collaborator of Alex. Savulescu, he worked with him at Bally Houses, str. Louis Calderon nr. 48-50, Bucharest, Romania (attribution);
1900 - "I. Alexi" House, str. Polona, Bucharest, Romania;
- the interiors of the Postal Palace, Bucharest, Romania;
- The Romanian National Museum of History in Calea Victoriei, Bucharest, Romania;
1903 - "Hermann Rieber" House, Bucharest, Romania;
1911 - expanding the dependencies of the Carol Goebl property, str. Doamnei nr. 16, Bucharest, Romania;
1911-1914 - "Dr. Gheorghe Nanu" House, Bucharest, Romania;
1912 - "Nicu N. Negri" House, Bucharest, Romania;
1913 - "Teodor Guilnain" House, str. Atena, Bucharest, Romania;
1924 - extension to Amzei Church, Bucharest, Romania;
1927 - "Grigore Popescu" House, Bucharest, Romania;
? -The Riber Carriage Factory (attribution);
? - The "Balaceanu-Stolnici" House, Str. Gina Patrichi nr. 4, Bucharest, Romania.
His collaborations at the Comunal Palace in Buzau, at the Administrative Palace in Iasi and at the Casino in Constanta are also well known.
Toma T. Socolescu, Fresca arhitectilor care au lucrat în Romania in epoca moderna de la 1800 la 1925, Editura Caligraf Design, Bucuresti, 2004.
Ruxandra Nemteanu, "Monumentul 2013",
in: Bucurestiul multicultural: 10 trasee urbane de arhitectura, Editura Istoria Artei, 2015.
Diana Cofșinski, http://www.revistaclipa.com/7432/2012/12/magazin/ziegfried-kofszynski-154-de-ani-de-la-nastere-80-de-ani-de-la-disparitia-sa