Maner Costerisan

Maner Costerisan is a historic and respected accounting and advisory firm headquartered in Lansing, Michigan, with deep roots dating back to 1906. The firm has evolved significantly through mergers and strategic partnerships, most recently merging with Grand Rapids-based accounting firm Baker Holtz effective January 1, 2026, expanding its capabilities and presence across West Michigan. The merger brought three additional partners and 28 staff members into the Maner organization, significantly strengthening the firm's resource base. Maner Costerisan has organized its practice around key industry verticals where clients concentrate their operations, maintaining dedicated teams for affordable housing, cannabis operations, construction, education, employee benefit plans, government, healthcare, high net worth individuals, manufacturing, nonprofit organizations, small and mid-size businesses, and telecommunications. The firm brings extensive specialized expertise to each sector, with notable achievements including 60+ years of experience in affordable housing with 95 percent Net Promoter Score, 30+ years in construction with 100 percent Net Promoter Score, 50 dedicated education industry specialists, 30+ years auditing employee benefit plans with 70 annual audits, 50 dedicated government specialists performing 150+ single audits annually, 50 dedicated nonprofit specialists with 100+ years collective experience, and 30+ years serving manufacturing companies with certified exit planning experts. The firm has received significant recognition including Accounting Today's Top Firms to Watch for three consecutive years, Crain's Detroit Business Best Places to Work in Southeast Michigan for four consecutive years, and recognition as a Top Wealth Firm by AUM.