"Comvita's vertically integrated high value-add business model is unique within the New Zealand primary sector," he said.
"It is especially difficult to make such fundamental changes to any business without destroying excellent business culture, but it is even more difficult when you are a listed company that must report each six months to shareholders who want financial performance and dividends."
Mr Craig said Mr Hewlett's dedicated commitment over the last 10 years' tenure, with support from board and staff, would be just the start of a period of stronger financial performance.
"He has put the company into a very strong position to deliver significantly better future returns."
Mr Hewlett said his decision to move on was a combination of the need to introduce new blood and a desire to pursue new career opportunities.
"A 10-year tenure for a CEO is quite a long time," he said.
"I think you reach a stage when you think perhaps a bit of new energy or perspective is a healthy thing. And also for me as well, as part of my career development, it's an opportunity to evolve and move on to something different."
Mr Hewlett said he would be focused on his current role up until his departure at the end of March 2016, but wanted to develop his career in governance and broader leadership roles. That was likely to see him taking on some directorships, including returning to the Comvita board within 12 months of his resignation next year.
"Prior to joining Comvita I developed a real passion for early stage and start-up businesses through working with the angel investment community," he said.
"I'm going to go back and have a play around in that area as well. I'm certainly planning to stay in the Bay of Plenty, and if I can develop some business interests here that would be a double plus. It's a good ecosystem here and well supported with strong networks."
Comvita results to March 31, 2015
* Revenues - $152.7 million, up 32.4%
* Earnings before interest, tax, depreciation and amortisation - $23 million, up 35.1%
* Net profit - $10.2 million, up 27.5%
* Dividends - 13 cents, up 8.3%