LOS-Leaders Operating System is a trade mark of TriAtis Global, a learning & development organisation in the UK, US & Africa. The methodology is made up of four pillars to develop you career and three core method ( 3LOS ) to accelerate your leadership journey. The method was 1st published in UK in January 2019 in the book Leavers To Leaders which is an international best seller and now available in 17 countries.