| Schema Owner | Email to Contact | Schemas |
| James Forester | jim@marinsoft.com | IfcSharedBldgServiceElements
IfcHvac |
| Thomas Liebich | thomas@cab1.m.eunet.de | IfcUtilityResource
IfcPropertyTypeResource IfcGeometryResource IfcKernel IfcProductExtension IfcSharedBldgElements |
| Richard See | richard.see@autodesk.com | IfcModelingAidExtension
IfcArchitecture IfcFacilitiesMgmt |
| Jeffrey Wix | jeffrey.wix@dial.pipex.com | IfcMeasureResource
IfcPropertyResource IfcProcessExtension IfcDocumentExtension |
| Jean-Luc Monceyron | monceyron@cstb.fr | IFC toolset development |