Lewis Howard Latimer was born in Chelsea, Massachusetts, (September 4, 1848-December 11, 1928) is considered one of the most important Black inventors for the number of inventions he produced and patents he secured, but also for the importance of his best-known discovery: a longer-lasting filament for the electric light. He also helped Alexander Graham Bell obtain the patent for the first telephone. Latimer was in great demand for his expertise later in his career as electric light spread across the country. Indeed, without Latimer's help and expertise, Thomas Edison may not have even received a patent for his light bulb. His inventions included an evaporative air conditioner, an improved process for manufacturing carbon filaments for light bulbs, and an improved toilet system for railroad cars.