![Exclusive: Shell global refining boss Ryerkerk to step down - memo](http://news.littlecdn.com/600x360/1534156203_5b715dab1bffa.jpeg)
Exclusive: Shell global refining boss Ryerkerk to step down - memo
The head of Royal Dutch Shell's global refining operations Lori Ryerkerk will step down at the end of the month after five years in a job where she oversaw a vast overhaul of the business, according to an internal memo seen by Reuters.