In Britain, he was financially successful and used his wealth to construct a mansion, Penbury Grove, near Beaconsfield, Buckinghamshire.

After the death of his first wife, he became involved in a bigamy case due to an attempt by a married couple to obtain his wealth through a fraudulent marriage.

He authored a number of works on electrical engineering, and a book on the genealogy of his branch of the Parshall family including a short autobiography.

[1] In 1912, he became involved in a widely publicised bigamy case - having been tricked into marrying a Mrs. Deborah Jeffreys in 1911, who had been forced under threat of death by her husband to pose as a widow and seduce and marry the widowed Parshall in an attempt to gain access to his wealth.

[6][10][11][note 2] In 1902, he constructed a mansion, Penbury Grove, near Beaconsfield, Buckinghamshire; a replica of Pennsbury Manor, the residence of William Penn of Pennsylvania.