Park Superintendent, City of Tacoma, WA, 1890-1892; Park Superintendent, City of Seattle, Seattle, WA, 1892-1895; Schwagerl produced the earliest city document to plan a system of Seattle parks. His system would have positioned four parks on the corners of Seattle's boundaries at Seward Park on the south, Sand Point on the east, Fort Lawton on the north and Alki on the west. He completed Kinnear and Denny Parks in Seattle, WA and proposed others. Schwagerl created a nursery covering six acres filled with fine plant specimens for use in Seattle's parks. A classified advertisement in the Seattle Times on 10/05/1905 under "Landscape Gardening," listed: "Schwagerl, Architect, Engineer. Phone East 2963." (See Classified Ad, Seattle Times, 10/05/1905, p. 16.)

Schwagerl came to the U.S. from Germany in 1854; he served in the Civil War, as an engineer from 03/1864-07/1865. He lived in Boston, MA, in 1866, and an "O.E. Schwagerl" worked as an "engineer/landscape architect" in Saint Louis, MO, in 1870. An "E.O. Schwagerl" working as an artist, lived in Cleveland, OH, in 1880. He worked in Tacoma, WA, at least between 1889-1891, but he also shows up in a Veterans' Register in Port Gamble, WA in 1890. He lived at 403 22nd Avenue South, Seattle, WA, in 1900.

Both of Schwagerl's parents were German.

Schwagerl married Francis Schwagerl (born 06/1859) who was 18 years his junior in about 1894. They had no children in 1900. Francis was from Canada, and her father was English and mother from MA. Francis Schwagerl immigrated to the U.S. in 1866.

Schwagerl applied for a passport 11/23/1866; he indicated on this application that he had been born in Wurtzburgh [sic], Bavaria, and was 25 years old. He had brown hair, a "Grecian nose," brown eyes and was 5 feet 11 inches tall. A witness, Gustavus D. Dowd, swore that he knew Schwagerl enabling him to get the passport. In 1870, the value of his personal estate was estimated at $3,000.