Jay Wittmeyer ya yi murabus a matsayin babban darektan Ofishin Jakadancin Duniya da Sabis, daga ranar 13 ga Janairu, 2020. Yana ɗaukar matsayi a matsayin babban darektan Lombard (Ill.) Mennonite Peace Center, inda ya kasance mataimakin darekta kafin ya yi aiki da Cocin of the Church. 'Yan'uwa.
A matsayin mai gudanarwa na Ofishin Jakadancin Duniya da Sabis na shekaru 11, tun daga Janairu 2009, Wittmeyer ya ɗauki nauyin farko na aikin manufa na Cocin Brothers kuma ya kula da ma'aikata a cikin Ma'aikatun Bala'i da Albarkatun Material, Sabis na Sa-kai na Yan'uwa, Abinci na Duniya Ƙaddamarwa, da Ofishin Gina Zaman Lafiya da Siyasa.
A lokacin mulkinsa, an samar da sababbin ƙungiyoyin ’yan’uwa da ke tasowa a Haiti, Spain, yankin manyan tabkuna na tsakiyar Afirka (Burundi, Jamhuriyar Dimokuradiyyar Kwango, da Ruwanda), da kuma Venezuela. Waje da samar da zaman lafiya a Sudan ta Kudu shi ma ya kasance fifiko. Ayyukansa sun ƙarfafa dangantaka da kafaffen Cocin ’yan’uwa a Brazil, Jamhuriyar Dominican, Indiya, da Najeriya. Ya yi aiki tare da shugabannin Ekklesiyar Yan'uwa a Nigeria (EYN, the Church of the Brother in Nigeria) yayin da arewa maso gabashin Najeriya ta sha fama da tashe-tashen hankula a lokacin da ake fama da rikicin Boko Haram. Tare da Babban Jami'in Harkokin Jakadancin Duniya da Ma'aikata Roy Winter, ya sa ido kan Rikicin Najeriya.
Muhimman abubuwan da ya yi a cikin aikinsa sun hada da ziyarar da ya yi da al’ummar Kirista a Cuba da kuma tafiya zuwa Koriya ta Arewa, inda ya yi nasarar sanya mambobin Cocin Brothers a matsayin malaman jami’a da ke koyar da aikin gona da Turanci na tsawon shekaru.
Nasarar ƙarshe ita ce “Vision for a Global Church,” takarda da Babban Taron Shekara-shekara ya ɗauka a cikin 2018 wanda ya buɗe yuwuwar taron kasa da kasa na wannan watan kan tsarin duniya na Cocin ’yan’uwa, wanda EYN ta shirya. Wittmeyer ya gudanar da taron wakilai daga Jamhuriyar Demokradiyyar Kongo, Jamhuriyar Dominican, Haiti, Najeriya, Ruwanda, Spain, da Amurka, wadanda suka tabbatar da kafa wata kungiya ta duniya a karkashin sunan wucin gadi "Global Brothers Communion."
Ayyukan Wittmeyer sun haɗa da shekaru biyu tare da Brethren Benefit Trust a matsayin darektan Tsarin Fansho na 'Yan'uwa da sabis na kuɗi na ma'aikata. Ya kuma yi aiki da kwamitin tsakiya na Mennonite a Nepal da Bangladesh.