This is David Frenette, a disciple of Thomas Keating, talking about his experience of Centering Prayer on the Buddhist Geeks podcast (sadly discontinued).
Frenette, along with Bourgeault, is what you might call a "second generation" Centering Prayer teacher as he has studied under Keating. Frenette has also published a book on the topic, called The Path of Centering Prayer.
As seen with Frenette, there continues to be a link between Zen Buddhist practice and Centering Prayer. Several people I have interacted with through this site share that same link.