Dan Holland

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Dan Holland

Senior Consultant

Building Pennsylvania - Philadelphia Office
Contact Dan

Area Of Expertise

Air Quality, Air Quality Monitoring & Modeling


The Pennsylvania State University, Bachelor of Science in Meteorology

Career Highlights

Mr. Dan Holland, one of the founding four Principals of ALL4, possesses more than 35 years of experience in the air quality consulting industry. His primary areas of technical expertise include air dispersion modeling and ambient air and meteorological monitoring. With his background in air dispersion modeling, Mr. Holland is able to provide an extra layer of valuable consulting experience on intricate New Source Review (NSR) air permitting projects. Acting as Senior Consultant or providing support to ALL4 Project Managers, he is able to identify key project issues and provide efficient solutions and strategies from the regulatory permitting perspective and air dispersion modeling perspective. He also has formed key relationships with local, state and Federal enforcement agencies that allow ALL4 to work efficiently and effectively within the framework of current air quality regulations.

Full Professional Profile


Air & Waste Management Association (A&WMA)
American Meteorological Society (AMS)

Get to know Dan

Have you ever had a nickname (or two)?  If so, what are/were they?

The Duke, Old Blue Eyes, and The Clipper are just some of the nicknames that my imaginary friends call me.

When you were 8 years old, what did you want to be when you grew up?

Mature, responsible, good-looking, wealthy, intelligent, Republican, oh well….

What is one of the most memorable experiences you have had at ALL4?

Opening the door for business on March 25, 2002.

What was the most memorable Halloween costume you ever wore?

Growing up in a household where my sister suffered from masklophobia, we did not celebrate Halloween.

Stick shift or automatic?


Who is the most famous person you have ever met?

It’s a tie among T. Woods, R. Reagan, W. Churchill, and B. Graham

Do you have any hidden talents that people you meet would not expect?

No, I am pretty much, “what you see is what you get”.

What are you known for at ALL4?

Nothing that is important and everything that isn’t.

If you were stranded on an island, what are three things you couldn’t live without?

Air, food, and water, duh…this is that Microsoft question, isn’t it?

What is the most unique thing about working at ALL4?

In all seriousness, there are no boring individuals working at ALL4.


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