He was the plumbing consultant to the Los Angeles Olympic Organizing committee for the 1984 Olympics. He was charged with the responsibility of the Olympic Villages at the University of California at Los Angeles and the University of Southern California.

He was selected by Shuwa Investments Corporation, Tishman West Companies and Shearson Lehman Brothers to develop the fire protection retrofit design to effect fire sprinklers for four high-rise office buildings in Century City, City of Orange and the City of West Hollywood. The assignments required Hellman / Lober, Inc. to assume the prime consultant role which included construction administration roles not normally under the province of an engineering consultant.

In 1997 Wolff DiNapoli in Los Angeles and Maritz Wolff in St. Louis selected Hellman / Lober, Inc. to provide consultation services to their chain of Fairmont Hotels and Four Seasons Resorts. Projects that the firm has renovated includes the new Tower at the Fairmont in San Jose, California, the Chilled Water Plant Improvements at the Fairmont Dallas, Texas, a major retrofit of the Hot Water Boiler Plant at the Fairmont New Orleans, improvements to the Chilled Water Plant at the Four Seasons Hotel Houston, and guestroom HVAC for the Four Seasons Resort in Nevis to achieve positive pressurization to mitigate damaging infiltration of humid air.

Wolff DiNapoli requested that the firm evaluate a previous proposal to provide air conditioning for the Four Seasons Biltmore Hotel in Santa Barbara; a property until 1998 had only hydronic heating for each guestroom. Previous consultants had suggested adding a chilled water system which would include an extensive installation of underground piping and a full chiller plant at a cost greater than $2.0 Million for the 96 guestrooms. Concerned with the cost Hellman / Lober, Inc. proposed converting the existing hydronic piping system to a condenser water system that would require the installation of an Evaporative Condenser on-site and re-use the existing piping; the budget was slightly greater than $1.0 Million. Each guestroom would receive a water-source heat pump in lieu of the console heater. Following the engineering and installation, the project was completed at 25% less than the projected budget by HLI and was done seamlessly not interfering with daily business of the resort.

Project types include healthcare, laboratories, hotels, and college campus projects. Herewith is a sampling of the projects under the direction of Stephen Hellman:

• Sheraton Premier Hotel – Universal City, California
• John Ascuaga's Nugget Hotel and Casino - Sparks, Nevada.
• Earthquake Damage Assessments funded by FEMA for various historical and public buildings in Los Angeles following the January 17, 1994 Northridge earthquake.
• California State University at Long Beach - University Student Union
• Luxor Hotel and Casino Expansion and Renovation - Las Vegas, Nevada.
• Vivarium Facility for House Ear Institute and the St. Vincent Medical Center - Los Angeles, California.
• Betty Ford Center – Children’s Training Pavilion – Rancho Mirage, California
• Fairmont Hotels in San Jose, Dallas, Kansas City, New Orleans and Boston
• Four Seasons Hotels in Santa Barbara, Austin, Houston and Nevis in The West Indies
• Ojai Valley Inn & Spa Improvements and Expansion
• CBS Television City – Sound Stages – Los Angeles, CA.