ROCKFORD, Ill.--(BUSINESS WIRE)--Savant Wealth Management, a fee-only registered investment adviser (RIA), announced it has partnered with Heritage Financial, a Massachusetts-based wealth management firm with $3.9 billion in assets under management (AUM) and offices in Westwood, Woburn, and Rockland. The partnership, Savant's largest, brings together two majority employee-owned firms and expands Savant's existing footprint in Massachusetts, where it already operates an office in Wellesley. Sava.