The managing director of Twitter in Ireland is stepping down from his role to join a venture capital firm.
Stephen McIntyre will be replaced by Mark Little, the former RTE journalist and presenter, founder and former CEO of Storyful.
He is currently Twitter's Vice-President of Media for Europe and Africa.
Stephen McIntyre is to join Frontline Ventures, an early stage venture capital firm founded by Shay Garvey and Will Prendergast with offices in Dublin and London.
After 4½ wonderful years, I’ve made the very hard decision to leave Twitter. I’m moving to the VC world to join @frontline.
— Stephen McIntyre (@stephenpmc) June 16, 2016
He has overseen the growth of Twitter's EMEA headquarters in Dublin from just four people in 2012 to over 200 today across 20 functions.
In a blog post, Mr McIntyre described his four and a half years at Twitter as the best years of his professional life and said the decision to leave was tough.
But he added that after a decade at US multinationals he is ready for something new.
"I'm proud of what we've built in EMEA - not just our business, but our business culture and the final part of my job is to ensure a smooth transition," he said.
"I'm drawn to the variety, flexibility, and learning potential of the Frontline role. But I'll miss Twitter greatly, especially working with some of the finest people in the industry. And I continue to believe in the importance of the Twitter service, which is more relevant culturally than it has ever been," he stated.
Mark Little will takeover Mr McIntyre's role on July 1.
He joined Twitter in December last year, around six months after he left Storyful - the media company he set up over five years ago to source and verify information and user generated content from social media feeds, which is then sold on to media companies.
His decision to leave Storyful came 18 months after he sold the firm to News Corp for €18m.
"I am delighted to be appointed head of Twitter in Ireland and lead our Europe, Middle East and Africa headquarters into the next phase of our development. We are looking forward to an exciting few months ahead of opening our new offices on Cumberland Place," Mr Little said in a statement today.
He takes over the helm of Twitter in Dublin at a time when the company is undergoing significant change and facing many challenges.
Thank you @Stephenpmc for everything you’ve done for Twitter. I look forward to continuing the @TwitterDublin journey
— mark little (@marklittlenews) June 16, 2016
The microblogging site is struggling with slowing growth among new users and its share price has dropped by more than half in the past year.
In October the company announced that it was going to shed 336 jobs, or about 8% of its workforce.
Co-founder and former CEO Jack Dorsey recently rejoined the company as chief executive and has begun implementing changes aimed at reversing its fortunes.
