1981: Thomas Zaucha founds Keystone Rehabilitation Systems.
October 1991: Mark DeSimone founds Northstar Health Services.
June 1993: DeSimone takes Northstar public.
November 1995: Northstar merges with Keystone. The combined company takes the Northstar name.
March 1996: Northstar's auditors from KPMG Peat Marwick resign. Northstar's board ousts DeSimone. Zaucha replaces DeSimone as Northstar's chairman. Northstar's board organizes a committee to investigate auditors' claims. Steven Brody, the company's outside director, leads the committee.
May 1996: NASDAQ suspends trading of Northstar's stock.
June 1996: Northstar hires Arthur Andersen to investigate auditors' claims.
July 1996: Shareholders sue Northstar for alleged securities violations.
September 1996: Northstar sues DeSimone and former company accountants for alleged fraud.
February 1997: Northstar's board ousts Zaucha. Former consultant Brody becomes chairman. Zaucha starts proxy fight over control of company. Zaucha sues Northstar's board for limiting shareholder rights.
March 1997: Northstar expected to release audited earnings results for fiscal years 1995 and 1996. Northstar expected to reapply for stock exchange listing. Northstar's shareholders expected to vote on control of company later in spring.
Sources: News reports and SEC filings