He was born in Christiania to Christian Birch-Reichenwald and Jacobine Ida Sophie Motzfeldt. His paternal grandfather was Paul Hansen Birch, his maternal grandfather was Peter Motzfeldt. Peter Birch-Reichenwald married Alette Marie Christensen, and the couple had eight children.
He served as mayor of Christiania during 1889.
In July 1889 he was appointed Minister of Labour as a part of the first cabinet Stang. He left in March 1891 when the first cabinet Stang Fell. He was elected to the Norwegian Parliament in 1892, representing the constituency of Kristiania, Hønefoss og Kongsvinger. He only served one three-year term. In March 1894 he was appointed Minister of the Interior as a part of the second cabinet Stang. He replaced Johan Henrik Paasche Thorne. He left in October 1895 when the second cabinet Stang Fell.
Christian Homann Schweigaard
| Mayor of Kristiania
| Minister of Labour
Hans Hein Theodor Nysom
Johan Henrik Paasche Thorne
| Minister of the Interior
Thomas von Westen Engelhart
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