NPP president Conrad K Sangma welcomed the former speaker at a rally at Adokgre village in North Garo Hills district.
Marak was earlier with the Nationalist Congress Party (NCP).
Speaking at the rally Conrad claimed that winds of change are blowing in both the Khasi-Jaintia and Garo Hills region as seen from the eight MLAs who quit their House membership and have joined the party (NPP) with the hope to oust the Congress from power.
In his address, the former speaker claimed the NPP is the only party that can guide the state towards development.
The NPP has announced candidates in at least 51 seats of the 60 in the state.
Assembly elections are due in Meghalaya this year as the tenure of the current Assembly ends on March 6.
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