Philip Allen founded DecisionSoft to develop commercial and Open Source software to support the integration of e-commerce systems. DecisionSoft's products are used to model data structures and business constraints for XML and EDI, automating schema maintenance and streamlining development and validation for clients with extensive e-commerce systems.

Philip actually started out trading financial derivatives for County Bank Limited (now NatWest Markets) and managing the US Dollar interest rate and currency swap desk for Swiss Bank Corporation, then based at the top of the World Trade Center in New York. In 1987 he joined a software startup that eventually listed on NASDAQ as CATS Software Inc. He spent ten years there working (inter alia) on product management, product development and release management, before becoming VP of Customer Services in Palo Alto, California.

In 1997 he moved to Oxford, England, where he founded DecisionSoft. DecisionSoft now counts the UK's Inland Revenue and other central government departments amongst its clients. He holds a First Class degree (MA) from Cambridge University.