About Us

Sustainable Engineering Solutions LLC was

founded to address a very real need in the construction industry.

We partner with contractors to carefully align design and construction

processes with the owner’s needs to make sure that all aspects of the project are completed

as conceptualized and scheduled in a way that allows construction to occur without delays, disruptions and unexpected costs.

Wendy Staso

Founder and CEO

Wendy Staso is the CEO and owner of Huckestein Mechanical Services, Inc. During her tenure there, she observed a very broken construction delivery model. Bid drawings were incomplete, contradictory, and sometimes completely inaccurate. and change orders were the only way contractors could make any money. She decided there had to be a better way. Huckestein has long been at the forefront of delivering mechanical energy efficiency projects, especially working with Energy Service Companies (ESCOs). These projects were delivered via a design-build model with no change orders permitted or the financial payback wouldn’t work. If this model could work for these projects, why couldn’t it work for all mechanical construction projects? Huckestein’s engineers had perfected the practice of producing quality, construction-ready blueprints for their own projects. Why not offer that same service to architects and owners even if Huckestein did not install the project? Thus Sustainable Engineering Solutions LLC was born:

  • To deliver MEP designs and drawings that meet owner requirements and are complete, easy to read, and construction-ready.
  • To minimize or eliminate the chance for change orders.
  • To enable contractors to bid the entire project, not guess at what is missing from the drawings.
  • To educate owners on the true cost of their project, not under-estimate and wait for the numbers to come in over-budget, sometimes double or triple what the owner expected.
  • To have all the information up-front.
  • To live by the principle: Measure twice, cut once.

Wendy is an innovator who works to solve industry problems using her 40+ years of experience. Since founding Sustainable Engineering Solutions LLC, she has set a high standard for how design and engineering services should be offered to clients. With a dedication to honesty, efficiency, and quality service, she uses her comprehensive industry experience and innovative thinking to bring sustainable solutions to her clients.

Jonathan K. Staso


Jonathan is responsible for the company’s financial functions including accounting, corporate finance, and investor relations. He has extensive experience in developing financial strategies, using his expertise in forecasting capital, staff, and facilities requirements as well as identifying monetary resources and developing action plans. He earned his Bachelor of Science in Business Administration from Carnegie Mellon University’s Tepper School of Business. He holds Series 7, Series 63, Series 79 licenses.

As the President of Huckestein Mechanical Services, Inc. Jonathan developed and maintained crucial banking relationships. In 2017, he oversaw the refinancing over $2.0 million in company debt and managed profitability growth of 250.0%

Jonathan uses his skills to establish operational finance strategies for Sustainable Engineering Solutions by establishing critical measurements and trends; determining production, productivity, quality, and customer-service strategies as well as designing systems, accumulating resources, resolving problems and implementing change. He also closely monitors financial performance by expertly measuring and analyzing results and initiating corrective actions to minimize the impact of variances.

Richard K. Wuenschell, C.E.M.

Design Manager

As one of the premier mechanical design-build experts in the tri-state region, Rick is renowned for his expertise in solving the most challenging of technical issues and is highly skilled at balancing the needs of the customer and the company to benefit both parties. He has more than 25 years of experience in all facets of the mechanical contracting business. A graduate of the Steamfitters Local #449 Apprenticeship Program, Rick holds an HVAC license in Pittsburgh, West Virginia, and Ohio and is a Certified Energy Manager through the Association of Energy Engineers.

To stay on the cutting edge with the latest industry advances while learning new skills and keeping his current skills sharp, Rick is also affiliated with organizations such as the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE), the Green Building Alliance (GBA), the Mechanical Contractors Association of America (MCAA) and the Mechanical Service Contractors of America (MSCA).

Rick oversees the design of every SES project, bringing his expertise in all aspects of building mechanical systems design, mechanical replacement projects in existing buildings and HVACR service and preventive maintenance to ensure complete and constructible design documents.

Mark S. Wolfgang, P.E, LEED AP BD+C


Mark Wolfgang is an Architectural/Mechanical engineer with more than 40 years of experience in the design of building mechanical systems. He is a graduate of The Pennsylvania State University where he earned his Bachelor of Architectural Engineering and completed his post-graduate work in Construction Management. Mark is a licensed Professional Engineer in Pennsylvania, Maryland, West Virginia and Ohio.

Mark is well-versed in all aspects of project implementation with his primary expertise in advanced HVAC systems design. He is highly skilled in client relations, engineering cost estimates, design team management, HVAC, construction cost estimating, completion of LEED submissions energy audits, Direct Digital Control System design and HVAC system commissioning.

For the past 20 years, he has successfully supervised mechanical department production efforts at various companies to ensure projects were completed to company standards, on time and within budget. Through collaboration with contractor partners, Mark ensures the projects designed by SES meet all code requirements, are constructible, and will work as intended.

Jarrod Bair

Senior Planning and Engineering Associate

Jarrod has 14 years of experience in designing HVAC, plumbing, and fire suppression systems for commercial and institutional facilities. He has extensive experience creating as-is and transitioning to as-built drawings for owner records. He has extensive experience planning construction projects from pre-design through completion. Jarrod is a professional engineering software expert, including AutoCad and Revit.

Nathan Stairs, Leed Ap

Mechanical Design Engineer

Nathan came to SES from Southern California where the design-build construction delivery model is regularly implemented. He brings the perspective of collaborative engineering/contractor teaming, effective communication with all stakeholders, and deep mechanical design knowledge.

Nathan possesses the unique combination of big picture thinking and relentless attention to detail. He works equally well in a team or individual environment. He has strong organizational and task management skills and consistently meets deadlines with a sense of urgency.

Nathan’s breadth and depth of mechanical engineering experience is an asset to SES and our clients. Ranging from hospitals to hospitality, he has performed all aspects of the profession including site surveys, system layout, load calculations, equipment selection, conceptual and detailed 2 and 3-D drawings, code compliance, project pricing review, start-up and close-out.

Stephanie Ossio

Mechanical Designer

Stephanie is a Mechanical Designer with more than 10 years of experience in many aspects of HVAC design including the following: hydronic and air system sizing and layouts, equipment design, code compliance, drafting and technical calculations. She has achieved success in the design of mechanical systems for an array of healthcare, commercial, municipal and industrial facilities.

Stephanie can work independently or as part of a team, leading or following as the circumstances dictate, to complete project designs under strict budgets and deadlines. Her experience ranges from performing site surveys to creating two and three-dimensional drawings to providing construction support. She is detail-oriented and able to multi-task effectively.

Stephanie’s strong communication and analytical skills enable her to navigate multi-discipline perspectives including engineers, facility managers, construction contractors, and owners, and to prepare clear and comprehensive written reports.

Stephanie attended both Ohio University and the Art Institute of Pittsburgh.