Retired IBM Executive Joins Ecoark's Board by Arkansas Business Staff Posted 11/8/2017 09:23 am Updated 4 months ago Ecoark Holdings Inc., which is set to be renamed Zest Technologies Inc., announced Wednesday that former IBM executive Michael Green has joined the company's board of directors. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access articles older than 15 days. Articles newer than 15 days are not included in this offer. Purchase Now Already have archive access? Login to view this article.