This demolition contractor is just one of the 100 fastest-growing urban businesses that will be honored this week at the annual Inner City 100 event, to be held on April 21 in Boston.

Today's Inner City 100 company...

HMB Contractors
Milwaukee
Revenue: $3.5 million
Employees: 36
A mentorship program with an established contractor helped CEO Heidi Brandt--who taught grade-school earth science for 11 years before founding her business--break into the male-dominated demolition industry. Now she's branching out. Brandt recently set up a plant where she plans to recycle material from demolition sites, including concrete, grass, and kitchen cabinets. "I don't believe in sending everything to the landfill," she says.