Question: Where does Bernhard Bielenstein's father work at?

Knowledge 1: Bernhard Bielenstein
Bernhard Max August Bielenstein (– 14 April 1959) was a Baltic German architect.Bernhard Bielenstein was born in Doblen in a family of pastor, linguist and ethnographer August Johann Gottfried Bielenstein.He studied at the Riga Polytechnic Institute (present-day Riga Technical University).He graduated in 1904, and thereafter continued his studies in Berlin.In 1905 he set up his own architectural firm in Riga.In addition, he worked at the Riga Mortgage Association.During World War I, he worked at different military offices in Pskov and Vitebsk.From 1918, he again worked as an architect in Riga.In 1939, he moved to Germany.He died in Heilbronn.In Riga he designed more than 30 residential buildings, mostly in a rationalistic form of Art Nouveau, though some of his buildings also bear influences from Latvian National Romantic style. [SEP] Knowledge 2: August Johann Gottfried Bielenstein
August Johann Gottfried Bielenstein  was a Baltic German linguist, folklorist, ethnographer, and theologian.Bielenstein was born in Mitau (Jelgava), where he also died.He studied at the University of Halle (in Prussian Saxony) like numerous prominent pastors in the Baltic region, and received a doctorate in theology from the University of Dorpat in 1850.He was granted an honorary doctorate from the University of Königsberg in 1883.The editor of the major Latvian language newspaper "Latviešu Avīzes" and a member of the St. Petersburg Academy of Sciences, Bielenstein was the author of numerous major works on linguistics and ethnography, including "Die lettische Sprache,nach ihren Lauten undFormenThe Latvian Language, Its Phonetics and Forms", 2 volumes, 1863–64) and "Die Grenzen des lettischen Volksstammes und der lettischen Sprache in der Gegenwartund im 13.JahrhundertThe Borders of the Latvian Tribes and the Latvian Language in the Present and in the 13th Century", 1892).He encouraged the collection of dainas, studied traditional wooden architecture, and examined castle mounds to identify them according to their description in ancient chronicles.Whilst Bielenstein made many seminal contributions to the study of the Latvian language and culture, he was also a fierce opponent of the Young Latvians and a staunch defender of the Baltic German tradition.
Knowledge 1: August Johann Gottfried Bielenstein
August Johann Gottfried Bielenstein  was a Baltic German linguist, folklorist, ethnographer, and theologian.Bielenstein was born in Mitau (Jelgava), where he also died.He studied at the University of Halle (in Prussian Saxony) like numerous prominent pastors in the Baltic region, and received a doctorate in theology from the University of Dorpat in 1850.He was granted an honorary doctorate from the University of Königsberg in 1883.The editor of the major Latvian language newspaper "Latviešu Avīzes" and a member of the St. Petersburg Academy of Sciences, Bielenstein was the author of numerous major works on linguistics and ethnography, including "Die lettische Sprache,nach ihren Lauten undFormenThe Latvian Language, Its Phonetics and Forms", 2 volumes, 1863–64) and "Die Grenzen des lettischen Volksstammes und der lettischen Sprache in der Gegenwartund im 13.JahrhundertThe Borders of the Latvian Tribes and the Latvian Language in the Present and in the 13th Century", 1892).He encouraged the collection of dainas, studied traditional wooden architecture, and examined castle mounds to identify them according to their description in ancient chronicles.Whilst Bielenstein made many seminal contributions to the study of the Latvian language and culture, he was also a fierce opponent of the Young Latvians and a staunch defender of the Baltic German tradition. [SEP] Knowledge 2: Hernando de Cabezón
Hernando de Cabezón, (baptized 7 September 1541 – 1 October 1602) was a Spanish composer and organist, son of Antonio de Cabezón.Only a few of his works are extant today, and he is chiefly remembered for publishing the bulk of his father's work.
Knowledge 1: August Johann Gottfried Bielenstein
August Johann Gottfried Bielenstein  was a Baltic German linguist, folklorist, ethnographer, and theologian.Bielenstein was born in Mitau (Jelgava), where he also died.He studied at the University of Halle (in Prussian Saxony) like numerous prominent pastors in the Baltic region, and received a doctorate in theology from the University of Dorpat in 1850.He was granted an honorary doctorate from the University of Königsberg in 1883.The editor of the major Latvian language newspaper "Latviešu Avīzes" and a member of the St. Petersburg Academy of Sciences, Bielenstein was the author of numerous major works on linguistics and ethnography, including "Die lettische Sprache,nach ihren Lauten undFormenThe Latvian Language, Its Phonetics and Forms", 2 volumes, 1863–64) and "Die Grenzen des lettischen Volksstammes und der lettischen Sprache in der Gegenwartund im 13.JahrhundertThe Borders of the Latvian Tribes and the Latvian Language in the Present and in the 13th Century", 1892).He encouraged the collection of dainas, studied traditional wooden architecture, and examined castle mounds to identify them according to their description in ancient chronicles.Whilst Bielenstein made many seminal contributions to the study of the Latvian language and culture, he was also a fierce opponent of the Young Latvians and a staunch defender of the Baltic German tradition. [SEP] Knowledge 2: Andrey Vilkitsky
Andrey Ippolitovich Vilkitsky  was a Russian hydrographer and surveyor.He was born in the Minsk Governorate.His son, Boris Vilkitsky followed up his father's work; the Vilkitsky Islands are named after him.

Answer: St. Petersburg Academy of Sciences