What are you meaning by this?
Often the threads are opened by the many members of this forum, but Sapien made the fields of those threads–with the exception of those fields in the ES Marketplace category.
There are #community-and-side-projects, wherein the various members of this community create and submit a proposal for those projects, which then Sapien turns into fields for that group and/or for us.
If the fields are for sale in the ES Marketplace, no. Those are made by others.
If the fields are purchased from the various official Sapien sales sites or on the various official Sapien YouTube channels, yes, Sapien made those fields. Sometimes, at the request of others (primarily, the #community-and-side-projects ) but he still made them.