Mr. Douglas has served as the GM in Houston since 1984, when he formed the predecessor entity known as Enterprise Mechanical Inc. He is responsible for the oversight and management of all aspects of the company’s operations. Mr. Douglas received his Mechanical Instructor Certification from Purdue University, serves as a Mechanical Instructor for Houston Community College and holds a Class “A” Mechanical Contractor’s license with the State of Texas. He served as the Chairman of the Texas Oversight Committee for Mechanical Contractors for 4 years representing mechanical contractors throughout Texas, in the contract negotiations with organized labor unions, and is a Director of the Ft. Bend Chamber of Commerce.
Mr. Douglas is an Army Veteran, and was honorably discharged in 1974. He has two daughters, a step-son, and four grandchildren that live in the greater Houston area. He is an active member of Lions International, Boy Scouts of America, Lighthouse Charity Team, Hemingway Look Alike Society, The Houston Livestock Show and Rodeo Bar-B-Que, CCA, and The NCRS (National Corvette Restoration Society). Mr. Douglas enjoys all outdoor activities, such as camping, boating, fishing, hunting, skiing, horseback riding, scuba diving, and sky diving. He also enjoys attending concerts, mostly country western of course.
Mr. Haynam has served as the GM at Anderson since 2005. He has been with Anderson as its predecessor entity since 1980, starting his HVAC career at Anderson as an apprentice installer, then transitioning to a lead installer, then to sales and sales manager, and then to GM. Mr. Haynam has received Tech-1 certification and training from Carrier and studied HVAC at Mt. San Antonio College. He holds a C-20 license in California and Nevada, has expertise in sales, service, preventive maintenance, plan and spec construction and design-build work. He has been married for 28 years, with four children and one granddaughter. He enjoys riding dirt bikes, playing golf, serving at his church and spending time with family.
Mr. Johnson was named Assistant GM of the Houston office in January of 2022. He started with AMS in 2011 as a Project Manager/Estimator working on some of the office’s largest accounts. Mr. Johnson’s career began as an test and development engineer in the auto industry working on engine components. He moved to power generation then eventually worked for a general contractor. In his role at the general contractor, Mr. Johnson became acquainted with AMS and eventually took an open position with AMS of Houston. He holds a Bachelor’s degree in Mechanical Engineering from Florida Agricultural and Mechanical University and a Master’s Degree from Rensselaer Polytechnic Institute in Engineering Science (Management of Technology). He also holds a State of Texas Class “A” mechanical license with endorsements for both comfort cooling and refrigeration. Mr. Johnson is married with two teen children that keep him busy going to all their sporting events.
Mr. Knight has served as the GM at Tri-Pacific for 10 years. He has been with AMS for 16 years and has worked in the HVAC industry for 31 years. He currently holds a C-20 Contractors License with the State of California. Mr. Knight has expertise in design-build work, large commercial applications and is capable of handling most any size commercial HVAC project. He enjoys spending time with his wife, playing golf, surfing and family time, especially with his 4 sons.
Mr. Lepak has been the GM at Southcoast since 2011. He has been with AMS for 12 years, previously working at the Anderson location. Mr. Lepak has been in the HVAC industry for 15 years. He specializes in new construction (plan and spec), retrofit and construction, as well as replacements of chillers, cooling towers, boilers, roof top units as well as split systems. He also has extensive experience providing HVAC air conditioning for the telecom industry in the form of split systems and/or wall mount units in order to cool the equipment serving the cell tower, as well as handling residential needs including but not limited to replacing existing equipment and/or designing a new system for an existing or new custom home.
Mr. Markle was named GM of the Indianapolis office in July of 2019. He has an MBA and is an experienced business professional with a demonstrated history of working and developing companies and people in multiple industries. Skilled in Sales & Distribution, Direct Sales, Customer Relationship Management (CRM), Sales Management, and Indirect Channel Sales. Strong entrepreneurship skill set focused in Business, Management, Operations and Related Support Services and recognized for strategic planning, organization and commitment in achieving goals, driving revenue and ensuring operational efficiency. Mr. Markle is a graduate of Purdue University, husband and father of two.
Mr. Nuñez was named GM of the Dallas office in October of 2013. He has been in the HVAC industry for more than 18 years, starting his tenure with AMS in Houston in 2000. He spent 13 years in sales and account management. While in Houston, he sold HVAC maintenance, equipment replacement and service/repair agreements. His primary focus was on hospitals and medical facilities throughout The Texas Medical Center. Mr. Nuñez sold light commercial HVAC equipment for 5 years prior to joining AMS. He received his Bachelor's of Business Administration with a Minor in Political Science from Stephen F. Austin State University in Nacogdoches, Texas. He is married and has two children.
Mr. Thomas was named GM of the Colorado Springs office in August of 2017. He has been with AMS since 2000 and has worked in the HVAC industry for more than 25 years. His career started as a helper/installer in Northern Michigan. After moving to Colorado in 1993 he continued with installation and completed 4 years as a sheet metal apprentice through Pikes Peak Community College. After completing his apprenticeship he then transitioned into a Journeyman Service Technician position advancing into commercial HVAC. While employed at AMS he has held positions from Journeyman Technician to Service Manager, then Project Manager and now General Manager. He has a diverse background in service, sales, preventative maintenance, retrofit and replacement, plan and spec construction and design build projects. His free time is spent thinking about snowmobiling, talking about snowmobiling, planning snowmobile trips, and actually snowmobiling.
Mr. Schellhardt has served as the General Manager in the Maryland office since 2003. In addition to his role as GM, he has served as the President of AMS since 2006. Prior to 2006, Mr. Schellhardt served as CFO of AMS for 10 years. Mr. Schellhardt has been in the HVAC industry for over 27 years. He worked at Boland Trane for 10 years and at EMD Mechanical prior to joining the AMS management team with Mr. Dunn in 1996. Mr. Schellhardt received his BS in Accounting and Business Administration from Delaware State University. He enjoys playing golf in his spare time and spending time with his family.
Mr. Sitch has served as the General Manager at ACA since April 2021 and has been with ACA 13 years; with a total of 31 years HVAC experience. As a journeyman, he received several HVAC certificates. In 2014 he accepted the Service Manager position with ACA and held that position until April 2021 when he was promoted to General Manager. He carries all state and local municipality licensing and an International Code Council Master Mechanical license. Mr. Sitch’s expertise is in commercial HVAC systems which includes building evaluations, proposals, management, budgeting, customer relations and sales. Mr. Sitch enjoys spending his free time with his wife doing home projects, travel (particularly cruises around the world), and the many activities Denver has to offer.
Mr. Sweetser has been with AMS Denver for over 27 years. He began his career with AMS as a Delivery Driver and soon transitioned into the field as a HVAC Apprentice Technician. After completing the 5-year apprenticeship he became a Journeyman Technician. In 2007 Mr. Sweetser accepted a Service Manager position with AMS and held that until 2019 when he was promoted to General Manager of the Denver office. He carries all state and local municipality licensing and an ICC Master Mechanical designation. Mr. Sweetser has expertise in commercial building HVAC systems which includes technical resourcing, repair, management, budgeting and sales. He is very proud of his roots and all the positions he has held with AMS. Mr. Sweetser is a devoted family man and enjoys spending his time off camping, fishing and in the outdoors.
Mr. Dunn has served as the CEO of AMS since 2006. Prior to 2006, he served as President of AMS for 10 years under the ServiceMaster company umbrella. Mr. Dunn founded EMD Mechanical in 1985, which later became one of the first companies acquired to begin the formation of AMS as it exists today. He has been a key executive on the AMS management team since its inception, and has been in the HVAC and construction industry for over 33 years. Mr. Dunn received his BS in Mechanical Engineering from The Johns Hopkins University. He enjoys deep sea fishing and spending time with his wife and children.
Mr. Schellhardt has served as President of AMS since 2006. In addition to his role as President, he serves as the General Manager of the Maryland office. Prior to 2006 Mr. Schellhardt served as CFO of AMS for 10 years. Mr. Schellhardt has been in the HVAC industry for over 27 years. He worked at Boland Trane for 10 years and at EMD Mechanical prior to joining the AMS management team with Mr. Dunn in 1996. Mr. Schellhardt received his BS in Accounting and Business Administration from Delaware State University. He enjoys playing golf in his spare time and spending time with his family.
Mr. McCrossan has been with AMS collectively for over 10 years. He previously served as the Controller for the Maryland office, joining the corporate office in 2007 and being elevated to CFO in 2009. Mr. McCrossan has over 20 years of industry experience and over 15 years experience serving as a Controller and/or CFO. He received his BS from the University of Maryland Business School and passed the Maryland CPA exam in 1995. Mr. McCrossan enjoys playing golf and spending time with his wife, two daughters and son.
Ms. Hilton began working at AMS in 1997. She has been in the construction and HVAC industry for 25 years. She received her BS in Management Studies at the University of Maryland, University College.
Mr. Gazan joined AMS in September of 2014, when he accepted the position as Corporate Controller. His previous 11 years of work experience was with a national public accounting firm and controller at a local construction company. He received his B.S. in Accounting and Business Management from West Virginia University and passed the CPA exam in 2009. Mr. Gazan enjoys spending his free time with his family.
Ms. Lotman joined American Mechanical Services in July of 2015 as the Human Resources Director. She has over 20 years of experience in the Human Resources field. She was Human Resources Director at Corporate Express for the Mid-Atlantic Region for 12 years and the Human Resources Director at Truland Systems for over 5 years. She received her SPHR in June of 2002. She's a HUGE Orioles fan and enjoys spending time at the beach with family.
Mr. Collier joined the AMS Corporate Office in March of 2019, as the Corporate Safety Director. Previously he had been with Anderson Air Conditioning, LP, an AMS office located in Fullerton, California, overseeing construction health and safety since 2016. He is a US Army veteran and proudly served with the 11th Armored Calvary Regiment for 6 years. He has his credentials from the Board of Certified Safety Professionals for Construction Health and Safety Technician (CHST). In his free time, he enjoys the outdoors and spending time with his wife and daughter.
Mr. Starr came to AMS in 2007. He has worked in IT since he started programming professionally at the age of 15. His education includes a B.S. in Computer Science and an MBA with an emphasis in Management Information Systems, both from the University of Missouri. Mr. Starr has worked on systems ranging from the mainframe databases and security at Chevron, down to mobile devices. He currently holds eleven Microsoft certifications including: Microsoft Certified Information Technology Professional - Enterprise Administrator, Microsoft Certified Systems Engineer and mulitple Microsoft Certified Technology Specialist certificates. He is happily married with a son and daughter in college.