I whakaaetia a Mark ki te mahi rōia i te tau 1994, ā, neke atu i te 24 tau ōna wheako ki ngā tautohe ā-ture me ngā tautohe arumoni. He tino tohungatanga ia ki ngā tautohe arumoni, ki te ture hanga whare me te hanganga, me ngā tautohe whenua me ngā rawa.
Mai i tōna whakaurunga ki te rōia i te tau 1994, kua puta a Mark i roto i ngā Kōti me ngā Taraipiunara nui katoa o Aotearoa, tae atu ki te noho hei rōia matua i roto i ngā whakawakanga i roto i ngā Kōti Takiwā me ngā Kōti Teitei, me ngā piira ki te Kōti Pīra me te Kōti Hupirimi. He maha tonu tana puta hei rōia i roto i ngā whakataunga arumoni, ngā whakataunga, me ngā takawaenga, ā, he kaiwhakatau me te kaiwhakawā i roto i ngā tautohe arumoni me te hanga. He tohungatanga motuhake a Mark ki ngā wāhanga o te ture arumoni, te whenua, me te ture hanga. Hei rōia arumoni, kua tohu a Mark i ētahi o ngā kamupene matua o Aotearoa i roto i te whānuitanga o ngā tautohe arumoni. He maha tonu tana puta i roto i te Kōti Teitei i roto i ngā take ā-ture me ngā take arumoni nui, tae atu ki ngā kereme kirimana me ngā kereme hara, ngā tautohe Ture Kamupene me te Ture Pūtea, ngā kereme Ture Hokohoko Tika, ngā tautohe kore moni me te peeke, ngā tukanga aukati me te rapu, ngā tukanga mahi motuhake, me ētahi atu tautohe uaua.
I roto i te ao ture whenua me te hanga, he kaitohutohu, he māngai hoki a Mark mō ētahi o ngā kamupene hanga rongonui o Aotearoa, ngā kaiwhakawhanake whenua, me ngā tohunga ngaio i roto i te umanga hanga me te hanga. He nui ōna wheako hei kaitohutohu i roto i ngā whakataunga me ngā whakataunga, ā, he kaitohutohu hoki āna ki ngā kiritaki mō te ture hanga me ngā take kirimana.
Kei roto hoki i ngā mahi whakatau tautohe a Maka te whakatūnga hei Kaiwhakatau i ngā tautohe arumoni, me te Kaiwhakawa i ngā whakataunga i raro i te Ture Kirimana Hanga.
He Hoa (Whakataurite) a Mark nō te Arbitrators' and Mediators' Institute of New Zealand, ā, he Hoa anō hoki nō te Chartered Institute of Arbitrators kei Rānana. Ko ia te kaiwhakarite o te Komiti Taupatupatu Taonga o te Tāmaki Makaurau District Law Society. He maha āna wānanga mō ngā take ture whakawa, whenua me te hanga whare.
Mai i te tau 2012, kua whakaako a Maka i te kaupapa whakangungu mō ngā pūkenga tautohe o te Rōpū Ture o Aotearoa.
Kei te piki haere hoki te hiahia o Mark ki te ture ahumahi waina, ā, kei te tautoko hoki i ana kiritaki. He kaitohutohu ia mō ngā kaihanga waina o Aotearoa mō ngā take arumoni maha, tae atu ki ngā kirimana tohatoha o te ao, te mana pupuri taonga hinengaro, te raihana waipiro me ngā paerewa pānuitanga.