John Bernard, the marketing manager for Canonical's OEM unit, will be leaving his position at the end of this week in order to move across to Mozilla's mobile Firefox OS unit.
A Canonical spokeswoman confirmed Bernard's decision to change roles in a statement on Tuesday.
"We can confirm that John will be leaving Canonical at the end of the week. After over three years at Canonical working on many of our marketing initiatives with OEMs, we wish John all the best in his new role at Mozilla," she said.
Bernard is expected to be taking up a similar marketing-based role at Mozilla to assist with the launch of the open-source Firefox OS platform.
Mozilla had not responded to a request for information at the time of writing.
Bernard's move into Mozilla's mobile ranks would make sense given his previous experience working on the Ubuntu platform, combined with experience from his former marketing roles in the UK for LG Mobile and the now-defunct Sony Ericsson venture.
UPDATE: A Mozilla spokeswoman confirmed to ZDNet on Wednesday that Bernard "will work for Mozilla on go to market for Firefox OS".