James D. Oberweis (born June 10, 1946) is an American businessman, investment manager, and politician from the state of Illinois. The owner of Oberweis Dairy in North Aurora near Chicago, he served as a member of the Illinois Senate, representing the 25th district from 2013 to 2021. Oberweis has been a perennial candidate for higher office; he sought the Republican nomination for the United States Senate in 2002 and 2004, and the Republican nomination for Governor of Illinois in 2006. He was the Republican nominee for Illinois's 14th congressional district in a March 2008 special election and the November 2008 general election, losing on both occasions to Democrat Bill Foster. In 2012, Oberweis was first elected to the Illinois Senate in the 25th district. He again ran for the U.S. Senate in 2014, losing to Democratic incumbent Dick Durbin. In 2020, Oberweis ran for a third time in the 14th congressional district, this time losing to Democratic incumbent Lauren Underwood. Education After graduating from Marmion Academy in Aurora, Illinois, he attended the University of Illinois at Urbana–Champaign, where he joined Phi Kappa Tau fraternity. He spent a year abroad, studying at Technische Hochschule Darmstadt. He received a Bachelor of Arts from Illinois, and then a Master of Business Administration from the University of Chicago. Career In 1968, Oberweis became a junior high school teacher at Waldo Junior High in Aurora, teaching math and science. In 1970, he changed careers and became an investment stockbroker. Within a few years, he was promoted to manager of a branch office. In 1976, he began publication of an investment newsletter, the Oberweis Report, which reported on emerging growth companies. The Report was rated highly among investment advice newsletters. In 1978, Oberweis and his first wife, Elaine, established their own investment management company, Oberweis Securities in Aurora, Illinois. In 1986, Oberweis purchased and assumed control of family business Oberweis Dairy. His father, Joe, had died in 1984, and Joe's successor (and Jim's older brother) John suffered an incapacitating stroke in 1986; after Jim's purchase he turned day-to-day operations over to outside presidents who embarked on acquisition programs highly leveraged with debt. Elaine Oberweis (University of Chicago MBA '89) left the brokerage business in 1989 to rescue the dairy business from near-ruin. He remained active in the investment field. In 1987, he founded Oberweis Emerging Growth Fund. In 1989, he established Oberweis Asset Management (OAM). OAM