Here are sample letters of invitation used by previous conference organizers for potential speakers.
Letter of Invitation to Potential Keynote Speaker for the 2001 Wharton European Conference (.pdf)
Letter of Invitation to Potential Keynote Speaker for the 2000 Wharton Africa Business Forum (.pdf)
Click here for a sample letter of invitation (.pdf) sent by the Wharton Dean to a potential speaker. If you would like to have the Dean send a letter to a speaker, please ensure you follow all the steps in the "Process for Obtaining the Dean's Approval for a Speaker Invitation or Brochure Welcome Letter."