A supply evangelist refers to a person who builds a critical mass of support for a supply source (within media advertisement), and then establishes it as a standard source of inventory in a market that is subject to network effects. An evangelist promotes the use of a particular source of supply through talks, news letters, PR, articles, blogging, user demonstrations, recorded demonstrations, or the creation of sample media plans. The word evangelism is taken from the context of religious evangelism due to the similarity of relaying information about a particular set of beliefs with the intention of converting the recipient. There is some element of this although most would argue it is more of showcasing the potential of a supply source to lead someone to want to adopt it for themselves.
The work of the supply evangelist resembles the work of a Technology evangelist with the difference that a certain media supply is evangelist instead of a Technology. However, a certain media supply might also be connected to a specific Advertising technology in a programmatic trading of media.
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