Robert von Moschzisker was born on March 6, 1870, to Franz and Clara (née Harrison) von Moschzisker in Philadelphia, Pennsylvania.
He was educated by private tutors and lost both of his parents during childhood, subsequently studying law under Edward Shippen beginning at age 13.
[1][2] In November 1909, Moschzisker was elected to the Supreme Court of Pennsylvania and assumed office as an associate justice in 1910.
Moschzisker was on President Warren G. Harding’s shortlist to replace Supreme Court Justice Mahlon Pitney after it become known that he was suffering from a terminal stroke;[3] however, the nomination eventually went to Edward Terry Sanford.
In his later career, he declined nomination to the United States Senate in the 1938 election.