H2M chairman and chief executive John Molloy, left, is retiring...

H2M chairman and chief executive John Molloy, left, is retiring at the end of the year; president and chief operating officer Richard Humann will succeed him. (March 6, 2012) Credit: David Pokress

H2M Group, an architectural, engineering and environmental firm in Melville, rarely makes news, and that is unlikely to change under new leadership coming next year.

H2M announced earlier this week that John Molloy, who has been chairman and chief executive for 18 years, will retire at the end of this year and be replaced by Richard Humann, who has been a vice president. Humann has been named president and chief operating officer; when Molloy retires, he will be chairman and chief executive.

In addition, H2M announced it has formed a new unit, H2M Water, which will seek national business.

Molloy, 66, has driven privately held H2M to revenues of about $40 million from less than $15 million 18 years ago. The company now has about 270 employees; there were about 180 two decades ago.

Molloy said the change in leadership has been in the works for about two years.

Humann, 43, has been with the company for nearly 25 years. He said he expects to hold the course. Will H2M be more in the public view? "I think we're very active already," Humann said. "The low-key perspective is [because] we're always standing behind our clients. It's by design."