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Plumbing & Mechanical Engineer

PM Engineer Next Gen ALL-STARS

2024 Next Gen All Star: Brennan Doherty

Top 20 Under 40 Plumbing Professional

By Nicole Krawcke
PM Engineer 2024 Next Gen All Star: Brennan Doherty

Image courtesy of Brennan Doherty

September 3, 2024

PM NextGen ALL-STARS 2024 badge small

Brennan Doherty

Age: 34

Company: MIFAB

Title: Director of Siphonic Drainage

How long have you been in the PHCP-PVF industry?

BD: Since I was 14. I started counting inventory annually at a local plumbing contractor where my father was controller and then doing downtown (Chicago) job site deliveries or being the extra hand around the shop to fill every open summer break into college.

What drew you into the industry?

BD: My first role out of college was working with Fastenal. There was an opportunity in my hometown to be outside sales, which in less than 10 months turned into the general manager role. During the first year managing, our store ended up hitting the top 1% in the country! This led my cousin, a plumbing manufacturer’s rep to this day, to reach out asking if “I was ready for something harder to sell than nuts and bolts?” About a week later I started my full-time job in the plumbing industry with Symmons covering the IL/Chicago Market with a team that instilled a solid foundation of winning together, and the accountability to achieve it.

What is the most rewarding aspect of working in the industry?

BD: The life-long friends made through ASPE and other industry organizations. These are now the people I’m calling to hang out with on the weekends, people I share those moments of success and strife with, and people I know will always show up for me regardless of whether or not we have any business together. I couldn’t be luckier to have landed here.

What motivates you every day?

BD: Passion! The fact I know Siphonic Roof Drains are better than traditional gravity drains with education being the only barrier. That I’m able to directly work with a growing number of Fortune 500 companies and developers to educate them on Siphonic Drainage, before working directly with their architecture, engineering, and construction teams to deliver a project from concept to completion. But mostly, that very few in the U.S. have figured out the immense value Siphonic Drainage brings to a project when it is so clear to see on paper — cost savings, reduced carbon impact, anti-clog drain, reduced MAX ponding, higher ceilings, less verticals, less civil pipework/trench, less calendar days, U.S. Code approved.

What is one thing you wish more people knew/understood about the PHCP-PVF industry?

BD: That there currently is no way for plumbing engineers to provide a trustworthy hydraulic head (MAX ponding depth) for any gravity overflow drain with a water dam in the U.S. market. Not one single published flow chart for gravity overflow drains. Nor, for that matter, could we even calculate with any confidence the expected gpm discharge in any traditional gravity system since there is no way to ensure a constant 2/3 air to 1/3 water mix in the pipe needed for MAX gravity efficiency — comments after ‘nor’ published in ASPE/IAPMO, June 2024: “Capacities of Stacks and Horizontal Drain in Storm Drainage System”, Table 2.2.

What has been your proudest moment in your career so far?

BD: Being the first to introduce Siphonic Roof Drains into the ASPE Plumbing Engineering Design Handbook, which led to being given the opportunity to sit on the most recent ASPE 45 committee that writes the Siphonic Standard governing the U.S. I also take great honor being included on this list.

What is one thing most people don’t know about you?

BD: The day I was elected Corresponding Secretary for ASPE Chicago Chapter’s Board of Directors, is the same day I first talked with the Vice President of MIFAB on the drive to the meeting. That day was also the first time I met Michael Whiteside, the owner of MIFAB, in person at that same ASPE event, only to receive a job offer that next Monday; I’ve happily been challenged ever since. Michael continues to give me the opportunity to prove my full siphonic vision, and all the tools to execute it. I feel incredibly fortunate to have had the opportunity to meet so many wonderful people across the country during my travels/time educating well over 3,000 individuals to this point.


Why he was chosen as a Next Gen All-Star Top 20 Under 40 winner:

“Brennan Doherty travels across the country meeting with owners, engineers, architects and design-build contractors to educate them on siphonic roof drainage. He is an active member of the ASPE 45 committee, that makes the Standards for Siphonic Roof Drainage in the U.S. This role followed his successful assistance to Ontario, Canada, in navigating siphonic drains, where he holds the only BMEC-approved siphonic drain through all of Canada.

“Brennan has published articles numerous on Siphonic Drainage in PM Engineer, but most notably helping introduce the topic into the ASPE Design Handbook.

“Brennan has visited well over half of the local ASPE chapters in-person to provide education, presented an ASPE national webinar, has been invited to speak at numerous municipalities, AIA, PHCC, MCAA, Tilt-Up, DBIA and IAMPO chapters, and most exciting has been accepted for a live session at this year’s ASPE National EXPO.

“Brennan also spends time educating local inspectors to ensure complete understanding; the State of Oklahoma dedicated three separate days to updating their inspectors this year.

“In a short time, many high-profile clients such as Walmart, Costco, Mayo Clinic, Scripps, BMW, Reno Airport, Columbus Crew Soccer Stadium, State Farm, NASA and countless others have transitioned projects from gravity-based systems to siphonic drainage upon seeing the reduction in ponding, overall project cost savings, and immediate carbon reduction.

“Introduced to the industry in 2015, Brennan started a local Chicago role with Symmons. After two years of closely working with a team that led by example, the Chicago Team was awarded top territory for the year. Shortly after, Brennan attended an ASPE meeting in Chicago, where he met Michael Whiteside, owner of MIFAB. After a quick, energy-filled conversation, he was offered a job with MIFAB the following Monday, where he has worked for the last seven years. While living in Chicago, Brennan volunteered for the ASPE board as corresponding secretary before taking over the treasurer role. In 2021, Brennan moved to Dallas to "not have to deal with snow," which is now his home base.

“Brennan has been instrumental in increasing the understanding of Siphonic Drainage in the U.S., certifying over 2,500 people in four years. His passion for the topic is evident in every interaction, and his ability to simplify complex concepts provides effortless understanding.

“Always ready to jump on a call, expand on any topic, or coordinate project changes, Brennan has made a DIRECT and positive impact on the plumbing amd mechanical engineering community, promising even more for the future if trends continue.” — Jason McDonald
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Nicole krawcke 2024

Nicole Krawcke is the former Chief Editor of Plumbing & Mechanical and PM Engineer magazines. She covered the HVAC and plumbing industries for BNP Media. She has more than 15 years of writing and editing experience and holds a bachelor’s degree in Journalism from Michigan State University.

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