Our Company

Who We Are

We are a manufacturers’ representative serving the specification and electrical construction community in DC, Northern Virginia, and Maryland. With an expansive portfolio of lighting, controls, electrical supplies, and window systems, we have the products and solutions your project requires. As a full-service agency, we offer many value-added services, including system startups and maintenance, healthy building design guidance, lighting calculations, energy audits, daylighting assessments, code compliance recommendations, prefabrication and productivity solutions, design-build assistance, and much more.

One Source Associates is comprised of highly qualified staff, many of whom have a rich history in the electrical industry. Our credentialed team includes LEED and AIA Associates, Lighting Consultants, Construction Documents Technologists, and staff certified in the most advanced lighting controls systems. From concept and design to completion and service, our team of former architects, lighting designers, electrical engineers, and electrical contractors knows all the right products and solutions for any job or project type.

We hope you will take some time to find out more about how we can assist you and the products we offer, and trust that if given the chance, we will make you glad you reached out to us.

Our Mission

To lead the industry with passionate regard for service, ethics, and customer satisfaction.

Our Vision

To be the leading representative in the markets we serve.

Our Values

Take Care of the Customer

  • Be Friendly
  • Be Responsive
  • Be Knowledgeable
  • Deliver Quality
  • Communicate Effectively

Take Care of Each Other

  • Be Respectful
  • Be Responsible
  • Challenge Each Other
  • Communicate Effectively
  • Provide Opportunities for Growth

Deliver Innovation

  • Ideas
  • Products
  • Solutions
  • Service

Be Professional

  • Honest
  • Ethical
  • Hardworking
  • Smart
  • Enthusiastic


  • Kidde 2021 Outside Salesperson of the Year - Todd Kollker
  • Kidde 2020 Representative of the Year
  • Kidde 2020 Outside Salesperson of the Year - Todd Kollker & Dustin Siciak
  • First Annual Tesla Awards 2020: Michael Best, LLC and Duke Ellington School of the Arts
  • 2020 Legrand Circle of Excellence
  • NovaFlex 2019 Outstanding Achievement Award
  • Modern Forms Achievement of 2019 Sales Goals
  • 2019 Kidde Sales Excellence

Company History


Downie Turner & Burress (DT&B) founded

First product lines:

Daniel Woodhead Co. and

Pass & Seymour


Maryland Lighting founded


Maryland Lighting expanded into DC/Northern VA market


DT&B awarded representation of Lutron


Maryland Lighting awarded representation of Hubbell Lighting


DT&B and Maryland Lighting merge to become One Source Associates


Launched eService customer portal for accessing real-time order status


Launched eService automated order notifications


Creation of One Source Technical Field Service Team


ESOP Established


Our values speak volumes about the culture at One Source. We believe in taking care of each other. When we learn together, we grow together. We believe in teamwork. When we work together, we achieve more together. We work smart, and we work hard, all in the pursuit of providing unmatched experiences for everyone we serve. Most importantly, we’ve built an atmosphere where we enjoy working, because staff who like what they do deliver quality experiences for our customers.

Diversity & Inclusion

We foster an atmosphere of respect, equity, inclusion, and diversity within our company, community, and industry. Our goal is continued progress and improvement of our actions as it relates to equality. We approach the challenge of meaningful change not as a single initiative or moment in time, but rather as a sustained effort across the full range of our priorities while equipping our staff to engage thoughtfully and respectfully with everyone.