It all started back in 1984, when a small family-owned business was founded in Ohio by John & Beverly Stewart. MSD, short for Mechanical Services and Design, was built on a foundation of quality work, service, and integrity. John Stewart, took the reins as CEO and President in 2015, determined to continue the legacy of the company his father and mother had started.

John is passionate about having a positive working environment that aligns with our company values, visions, and goals. He has led the organization to continuous growth and success, transforming MSD into a facility solution provider offering Service, Construction, Manufacturing & Engineering services.

  • Service:
    Commercial Maintenance Services
    Commercial HVAC
    Commercial Refrigeration
    Commercial Plumbing
    Commercial Drain Cleaning
  • MSD Technologies
    Commercial Fire Alarm & Security
    Commercial Building Automation
    Commercial Electrical
  • Construction:
    Commercial Construction
    Commercial VDC Coordination
    Commercial Fabrication
  • Manufacturing:
    Commercial Manufacturing
  • Engineering:
    Commercial Engineering
    Commercial Energy Services

As MSD continued to grow and expand, John knew it was time to open a physical office in the Cincinnati area. In 2022, the grand opening of the Cincinnati office took place, and it was a huge success. Our team was grateful to all the sponsors, partners, clients, and food trucks that helped us celebrate this milestone.We also have expanded our services offerings into Columbus, Ohio.

Our mission at MSD is to deliver 100% Client satisfaction providing facility comfort & sustainability. MSD is a single-source solution provider, offering a range of services that are aligned with maintaining, enhancing, and extending the life expectancy of your facility. Our team members are committed to delivering a client-centric mentality that prioritizes the health and success of our client relationships. We understand that these relationships are crucial to our company's continued growth and success.The MSD Client Centric mentality consists of our team members committed to Securing, Maintaining, Supporting and Retaining our Client Relationships. These four pillars represent the key areas that we focus on in order to provide the best possible service to our clients.

Our team of highly trained associates are committed to always listening to your needs, assuring expectations are exceeded, and allowing the focus to be on your core business. We understand that your facility is more than just a building, it's the foundation of your business. That's why we pride ourselves on being more than just a service provider, we are a partner you can count on!

Our Purpose: Live to Serve

Our Niche: Helping clients make informed decisions through relationship-based consulting. 


Work Place Values


Industry leading provider of facility comfort & sustainability.


Deliver 100% Client satisfaction providing facility comfort & sustainability.


  • Transparency: Open Communication
  • Relentless: Find A Way
  • Expertise: Trained & Specialized
  • Enjoyment: Have Fun

Meet the Team

Our team brings decades of combined experience to serve you and your business. MSD has assembled a panel of experts for each service line we offer. Contact us and tell us how MSD can help your business run at its best.

MSD Leadership Team Headshots

John Stewart has 35 plus years within MSD and the expertise in the Mechanical Contracting and Services industry. As CEO / President and owner, John has led the organization’s growth into a $40 million plus company. He creates a positive working environment in line with company values, visions, and goals. With a productive working culture – and a clear set of company values, he drives consistent, high levels of performance across the whole company.  He is the lead on developing high quality business strategies and plans ensuring alignment with short-term and long-term objectives. He leads and motivates subordinates to advance employee engagement and has developed a high performing leadership team.

John Stewart - President/CEO

MSD Leadership Team Headshots

Mark has a Bachelor of Science degree in Finance from Wright State University, with over 40 years of experience in the Financial, Accounting, and Banking industries, Mark possesses the knowledge, experience, and ethics to guide and recommend methods and best business practices to ensure the company’s financial success. He is a key executive on the leadership team, focusing on strategic business planning, as well as cultural and change management.

Mark Turvene - Chief Financial Officer


Jackie holds a degree in Business Management/Human Resources as well as certifications in PHR & SHRM-CP. With nearly 30 years of experience working with Human Resources and Safety teams she is a great asset to our organization. Jackie is very passionate at supporting our internal employee relations, talent acquisitions and overseeing our safety compliance. Her passion is critical with creating an ideal environment for all team members to experience continued success with Team MSD.

Jackie Tangeman, VP Human Resources

MSD Leadership Team Headshots

Nick holds a B.S. Degree in Construction Management & Technology, and a passion for consistently delivering an exceptional client experience! As our VP Of Business Development, Nick works with our Business Development, Estimation, Engineering, Sales and Marketing teams, assuring our clients ongoing building infrastructure needs are supported with efficient and economical solutions.

Nick Davis - VP Business Development

Brad attended MVCTC Trade Technology and has over 24 years of experience in Management. Brad worked as Construction Operations Manager and has recently taken the title of VP of Operations. He encourages and seeks opportunities for collaborative efforts to understand issues, anticipate and trouble shoot problems. Brad ensures that MSD’s values are understood and acted upon by fostering a culture that is built on quality work, service, and integrity.

Brad attended MVCTC Trade Technology and has over 24 years of experience in Management. Brad worked as Construction Operations Manager and has recently taken the title of VP of Operations. He encourages and seeks opportunities for collaborative efforts to understand issues, anticipate and troubleshoot problems. Brad ensures that MSD’s values are understood and acted upon by fostering a culture that is built on quality work, service, and integrity.

Brad Bradley - VP Operations

Give to Grow - GreenBlack

At MSD Inc, we understand the importance of community involvement and strive to make a positive impact in the communities in which we operate. In 2020 and 2021, despite the challenges posed by COVID-19, we were able to give back in a variety of ways, including providing meals to the Victory Project young boys, donating to the Foodbank, participating in the Making Strides Against Breast Cancer event, and supporting the Special Olympics' Polar Plunge.

Our Give to Grow Commitment further demonstrates our commitment to community involvement and helps us establish valuable relationships and a sense of belonging in the community. The community involvement committee takes a proactive approach, putting the needs of the community first and prioritizing ways in which we can make a positive impact.

By volunteering in the community, we are able to help individuals grow and feel the love and support of their community. In addition to creating goodwill, our community involvement efforts help to improve the overall quality of life in the areas in which we operate.

Moreover, our involvement in the community not only benefits those in need, but it also has a positive impact on our employees. Participating in volunteer opportunities helps to build a positive culture within the company and can also foster teamwork and a sense of personal fulfillment among our employees.

At MSD Inc, we are committed to being an active and engaged members of the community, and we believe that by giving back, we can help foster a deeper sense of unity and support the development and success of community members.

  • The Foodbank (Dayton) – collected non-perishable items, our 12th year of participation.
  • Making Strides Against Breast Cancer – due to COVID-19, the walk was canceled, so MSD donated to the cause by matching purchases of employee Breast Cancer shirts
  • Polar Plunge held by the Special Olympics.
  • Giving Tree – MSD was given 4 families to purchase Christmas gifts for to bring joy to these families during the holidays.
  • Victory Project – provide meals 3-4 times a year.
  • Spirit League - opportunity for children, teens and young adults with special needs to get together and play basketball (ages 5 and up).


MSD offers professional, skilled trades, and co-op opportunities. If you are excited about enhancing and building a rewarding career, MSD may be the solution. As an associate of MSD, you can expect an environment that encourages you to perform at the highest level in all of your pursuits. Sharpen your skills, grow your confidence, and maintain a productive balance between life and work.

To apply for any of our open positions, submit a resume to our Human Resources department at Careers, or by visiting MSD headquarters at 4401 Springfield St., Dayton, OH 45431 Monday-Friday from 7:30am-4:30pm. MSD is proud to offer a range of benefits to provide security today, and plan for a satisfying retirement. In addition to medical, dental, vision, voluntary life insurance coverage, short term disability, profit sharing and 401k options, our employees enjoy:

  • Competitive Wages
  • Challenging and rewarding work
  • A range of working environments
  • Training and education opportunities
  • Career advancement opportunities

MSD has an Equal Employment Opportunity policy for recruiting, hiring, training, and promoting persons in all job titles, without regard to race, color, religion, national origin, age, marital or veteran status, handicap and sex except where sex is a bona fide occupational qualification


Working for MSD isn’t just a job that pays the bills today. We invest in our employees by offering continuing education through our Mini-University, apprenticeship programs, and leadership training.

We realize that our future depends on our employees, therefore your continued growth and development is as important to us as it is to you.

School-to-work for High School Seniors:

  • High School Seniors participating in a Career Center
  • Opportunities are available for the company-paid tuition to apprenticeship program
  • Earn valuable construction experience
  • College Co-ops or Internships for College Students:

Construction Management students:

  • CAD Design students
  • Gain experience in project management, estimating, drafting, field applications, and more

College Graduates:

  • Project Engineers
  • Project Management
  • Estimating