When, in 1991, a tenant’s group at the Henry Horner Homes hired Don Kimball, Kimball figured it was just another job. Kimball was a forensics engineer; he inspects and repairs faulty construction. Which is why the Horner residents needed him. The residents were filing a lawsuit against the Chicago Housing Authority over conditions in the complex and they needed Kimball to put together a report. So Kimball, a nattily dressed, silver-haired Bedrock republican, ventured into the Henry Horner Homes. What he saw there changed him forever.