what to we call a person who presents in a training workshop?

The person who presents a training workshop is often called the "presenter."

Sometimes this person is the "workshop leader."

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The term depends in part on what kind of workshop:

Is it a one-person speaker teaching one particular topic?

Examples:

> The sales rep holds a workshop to teach the employees how to use the new equipment.

> A government employee outlines the new waste disposal regulations

This person is the "speaker, instructor, leader, presenter."

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Or is it a workshop where everyone participates and gives their views?

Example:

> How do the employees feel about the changes that the new ownership is making?

> What should we do to solve the daily arguments over the limited parking spaces?

The person in charge of a group like this may be called the facilitator, leader, coordinator

A facilitator is a person who guides a group discussion

http://en.wikipedia.org/wiki/Facilitator