Hendry joined Melia Hotels International this week as global account manager for MICE UK, Ireland and Scandanavia.
Hendry's role at at Grass Roots Meetings & Events was commerical, planning and solutions lead, having previously worked for Maritz Travel Company, Network Rail and Banks Sadler.
Hendry said: "I am delighted to be taking a new direction in my career and really look forward to representing Melia Hotels within the UK MICE industry at a global level."
Grass Roots wil not be directly replacing Hendry's role. Des Mclaughlin, divisional director of Grass Roots Meetings & Events, said: "We won't be directly replacing Neill, but we are currently assembling a solutions team that will sit across all our event services and ensure we present complex solutions seamlessly."