O’Shea Builders started when John Timothy O’Shea (O’Shea President Mike O’Shea’s great-grandfather) listed himself as a contractor in the Springfield, Illinois City Directory in 1900.
His parents, James and Johanna O’Shea, immigrated to the United States in 1852 from Ireland, at the end of its devastating potato famine. About two million Irish fled here to escape hunger and poverty, according to the Library of Congress.