Background
Born in King and Queen County, Virginia in 1810, the son of Solomon Pahlen, a Russian emigrant, he was educated at the University of Virginia, Charlottesville and graduated from the University of Maryland, Baltimore"s School of Medicine in 1835.
Career
Thereafter, he settled in Vicksburg, Mississippi, where he began his medical practice. After seven years, in 1842, he relocated to Saint Louis, Missouri, where he was named professor (later Chair) of obstetrics and the diseases of women at the Saint Louis Medical College, where he founded and served as president of the Saint Louis Academy of Science, and for several years was president/curator of the Saint Louis Medical Society. During the Mexican-American War, Pallen occupied the position of contracting surgeon at the United States Arsenal at Saint Louis, and a little later he was health officer of the city during the cholera epidemic of 1849.
Moses and Janet Pallen had six children.
He died on September 24, 1876 in Saint Louis, Missouri. The cause of death was recorded as atony of the bowels.
His body was interred in Bellefontaine Cemetery, Saint Louis, Missouri.