La Roca is a member of the Micah Network
Marnix was the CEO of Tear Netherlands for 12 years until 2015. He chaired the Micah Challenge International Board and was on the Micah Network Board. Marnix then chaired Micah Global during the transition period in 2015. He has also been intrsumental in the set up of Micah Netherlands.
Tear Netherlandsis a member of Integral Alliance and Marnix has played a key role in this humanitarian focused alliance.
Marnix and his wife Geke has served in Thailand, working in schools and with refugees. They now live in the Netherlands.