Emma Renee Dutton, Content Specialist

2012 40 Under 40: Andrew Lasse, PE, LEED AP, 34

Associate Principal, Interface Engineering, Portland, Ore.

2012 40 Under 40: Jonathan Mesik, PE, CPD, LEED AP, 34

Associate, Director of MEP Engineering, Holabird & Root, Chicago

2012 40 Under 40: Jason Lund, PE, LEED AP, 34

Durham Office Leader/Senior Project Manager, RDK Engineers, Durham, N.C.

2012 40 Under 40: Yury Y. Lui, PE, LEED BD+C, CEM, BEMP, DCEP, REP, EBOM, 36

Worldwide LEED Practice Leader, Regional Mechanical Department Leader, HP/EYP Mission Critical Services, Chicago

2012 40 Under 40: Erin Lowery, PE, LEED AP BD+C, 34

Senior Associate, Facilities Engineering Group, Primera, Chicago

2012 40 Under 40: Julianne F. Laue, PE, LEED AP BD+C, BEMP, 39

Senior Associate, Sustainability Specialist, DLR Group, Minneapolis

2012 40 Under 40: Martin Howell, LEED AP, CEM, 39

Associate, Arup, Los Angeles

2012 40 Under 40: Lee Harrelson, PE, LEED AP, 31

Owner, Principal, Senior Mechanical Engineer, TM/R Engineering, Arlington, Va.

2012 40 Under 40: Andrew Heitman, CxA, CEM, LEED AP BD+C, CEA, CBCP, 36

Founder, Building Energy Sciences LLC, Pensacola, Fla.

2012 40 Under 40: Frank Muscarella, PE, LEED AP, 39

Senior Vice President, WSP Flack + Kurtz, New York