HMMH (Harris Miller Miller & Hanson Inc.) is a consulting firm specializing in environmental and transportation planning, with a strong focus on noise and vibration control. They generate revenue by offering expert services in acoustics, air quality, and sustainability to both public and private sector clients. Founded in 1981, HMMH has played a pivotal role in major infrastructure projects, providing innovative solutions to complex environmental challenges. Their expertise is recognized globally, making them a leader in their field.