Unfortunately, I don't have that information but you maybe be interested to know that we used his important work on spiritual intelligence (especially 2003) as one of the starting points in developing our Development Journey to Transpersonal Leadership as detailed in our book "Leading Beyond the Ego", https://www.leadershapeglobal.com/lbte-second-edition . Spiritual Intelligence as a science and theory has been developed in different ways by many authors but the most scientific and well researched (and most relevant to leadership), in my view, are Danah Zohar and Richard Griffiths.
However, spiritual Intelligence alone is insufficient and in our experience it is particularly important to combine with rational and emotional intelligence in order for leaders to ably lead in today's complex world - which is explained in detail in our book.