President and principal contributor to Open4Tax Bischoff’s eighteen years of senior management experience in the U.S. and Europe includes sales, business development, and product engineering.

Prior to founding Open4Tax (a division of adTumbler LLC) Bischoff was Director of Sales Engineering at Sentilla, Inc., where he managed early customer adoption of Sentilla Energy Manager™, enterprise software for managing power use in data centers, Green Product of the Year - Techworld 2009.

Bischoff’s earlier experiences include the founding of InSite Computer Technology, a software products and consulting company based in the UK. As CEO of InSite he directed Microsoft in the positioning, early sales strategies and channel development for Microsoft Exchange.

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