As I listened through the interview that I conducted with John Major Jenkins at his home in April 2016, I realized that there are a lot of very specific references layered into the interview, each of which would make a good post on its own. So, what I’ll do is go through the JMJ interview and create a series of annotations as individual blog posts, creating a link for each at the bottom of the original interview page, so that there is one page with the interview and links to each of the annotations.
The first reference, only 35 seconds into the interview is perhaps the most salient for people who know the connection between John Major Jenkins and Terence McKenna, namely that Terence wrote the Foreword to JMJ’s book Maya Cosmogenesis 2012: the True Meaning of the Maya Calendar End-Date (1998). Jenkins tells the 
story of how this came to be elsewhere in the interview. The short version is that the two had been corresponding since the early ’90s about material related to the Mayan calendar, as well as the I Ching (both had been members of an I Ching mailing list). Terence was giving a talk in Colorado in 1996, and JMJ went to the venue and ran into Terence who gave him a pass to the talk and the two ended up at lunch where JMJ asked about publishers for his book, and Bear & Company came up (with some reservations) as they had published the Trialogues at the Edge of the West book that contained transcripts of some of Terence’s conversations with Rupert Sheldrake and Ralph Abraham at the Esalen Institute. As JMJ entered negotiations with Bear & Company, he suggested the possibility of having Terence write a Foreword, and the idea was met with enthusiasm. Although Terence and JMJ both wrote about 2012 and mutually influenced each other, there ideas were fairly different (particularly in that Terence placed the fulfillment of the eschaton in a single dramatic moment at the end of the Timewave, where Jenkins offered a 36-year window, “Era-2012,” that would be a slow passage and an cosmic opportunity for transformation and renewal). Nonetheless, because of Terence’s contribution to JMJ’s book, their views have often been conflated, to the point that Terence had to publish a written response distinguishing their views. Nonetheless, it was, in part, Terence and Dennis’ suggestions in The Invisible Landscape that led to Jenkins’ interests and it was also, in part, Jenkins’ research in the mid-to-late ’90s that strengthened Terence’s convictions that he was onto something significant. So, despite the differences in idea, they were important collaborators and co-contributors to the spread of the idea that there was something significant about the year 2012 that was somehow built into the clockwork of the cosmos.
Here’s Terence’s Foreword to John Major Jenkins’ Maya Cosmogenesis 2012, written in January 1998 (screenshots from Google Books):
