Joseph Tkach ndi M'busa General ndi Wapampando wa Bungwe la «Mpingo wa Mulungu Padziko Lonse », WKG mwachidule, Chingerezi "Mpingo wa padziko lonse lapansi". Kuyambira 3. April 2009 mpingo unasinthidwa kukhala «Grace Communion International ». Dr. Tkach wakhala akutumikira Worldwide Church of God monga mtumiki woikidwa kuyambira 1976. Anatumikira madera ku Detroit, Michigan; Phoenix, Arizona; Pasadena ndi Santa Barbara-San Luis Obispo.
Bambo ake, a Joseph W. Tkach Sr., anasankha Dr. Tkach kwa Pastor General. Mkulu Tkach anamwalira mu September 1995 pamene Joseph Tkach anakhala M'busa General.
Dr. Maphunziro a Tkach anaphatikizapo kupita ku Ambassador University kuyambira 1969 mpaka 1973, kumene adalandira digiri ya master mu zaumulungu. Mu 1984 adalandira digiri ya kayendetsedwe ka bizinesi kuchokera ku Western International University ku Phoenix, Arizona. Mu May 2000, analandira PhD ya zaumulungu kuchokera ku yunivesite ya Azusa Pacific, Azusa, California.
Zomwe adakumana nazo pantchito yothandiza anthu zinayamba mu 1976 akugwira ntchito ku Arizona's Boys Ranch, bungwe laokha. Iye anali ndi udindo wokonza ndi kukhazikitsa mapulogalamu a kukonzanso kwa ana olakwa. Kuyambira 1977 mpaka 1984 adagwira ntchito yothandiza anthu m'boma la Arizona. Anathana ndi njira zothandizira mwayi wachitukuko wa anthu omwe ali ndi mavuto m'dera la chikhalidwe cha anthu. Kuyambira 1984 mpaka 1986 adagwira ntchito ku Intel Corporation ku Phoenix, komwe adatsogolera dipatimenti yopitiliza maphunziro mu gawo lautumiki. Mu 1986 analembedwa ntchito ndi Church Administration of the Worldwide Church of God.
Kukula kwachikhristu, kulalikira, ndi umodzi ndizofunika kwambiri kwa Joseph Tkach. Iye amatumikira m’gulu la oyang’anira a National Association of Evangelicals ndipo akutumikira m’bungwe la tchalitchi la American Bible Society. Kwa Mission America amathandizira ndikugwirizanitsa maukonde achikhristu pa ziphunzitso zosachokera m'Baibulo za zipembedzo zina. Amagwiranso ntchito ku komiti ya udokotala ya Azusa Pacific University. Amakhala nawo pamisonkhano yapachaka yachigawo ndi yapadziko lonse ndi atsogoleri a Worldwide Church of God kuti alimbikitse kukula kwachikhristu, kugawana malingaliro, ndikukambirana zolinga za Mpingo za chaka chamawa.
Iye anabadwa pa 23. Adabadwa mu Disembala 1951 ku Chicago, Illinois, ndipo adakhalako nthawi yayitali yaubwana wake mpaka makolo ake adasamukira ku Pasadena mu 1966. Iye ndi mkazi wake, Tammy, anakwatirana mu 1980. Ali ndi mwana wamwamuna, Joseph Tkach III, ndi mwana wamkazi, Stephanie.