We just wrapped up a marketing automation review of Infusionsoft. Scott Martineau and Eric Martineau founded the company in 2001 as custom softward for small businesses. Clate Mask was brought in later to be the CEO.
In 2004 they built a mortgage specific CRM with automation, MortgageProCRM. After that they created a more generic product called ManageCRM which become InfusionCRM and later Infusionsoft. Headquartered in Gilbert, AZ. 150 employees with 6,000 companies with 20,000 users. 4 users per company.