Lakeland manufacturer continues as top supplier of N95 masks ACI has manufactured 90 million N95 masks After the boom in business due to the pandemic, the mask maker will stay in business. and last updated 2021-06-01 18:43:24-04 LAKELAND, Fla. â Masks are still a very much needed tool in protecting healthcare workers from COVID-19. âCurrently we have just north of 450 employees,â said Matt Muller, president of Advanced Concept Innovations. Advanced Concept Innovations in Lakeland hired an additional 300 workers last April as their production of N95 respirator masks, ramped up ...