Millennials are eager to make an impact, which makes them ideal for start-ups.

If you're entitled, you likely think you know more than you do.

Every day, write down a few frustrations. And then at the end of the week, you'll have maybe 10 problems. By the end of the month, maybe you have 40 to 50 problems. And then you can spend time thinking about, Is there a viable business in solving any of these everyday frustrations?

My grandfathers on both sides were entrepreneurs.

When my three co-founders and I started Warby Parker in 2010, our primary intention was to sell good-looking, affordable eyewear online.

For any collaboration to work, each partner must have a strong sense of identity. If one overpowers the other, it's like mixing lemonade with water - you wind up diluting the brew.

We all have a personal recipe for productivity. One person may need six cups of autonomy and just a pinch of collaboration. Another person may require heaps of sociability and noise, with just a teaspoon of occasional privacy.

All companies - and not just startups - face the same eternal challenge: resource allocation.

When you look at the reasons people leave companies, it's usually because their boss is a jerk or because they aren't learning and growing.

It's never easy asking for help.

On the day it launched, Warby Barker received more than twice as many visits as our regular site.

Every moment contains an opportunity to create feelings of satisfaction and excitement in a customer. It's up to retailers to make it happen.

The key to an ideal workplace, in one hyphenated word, is this: self-awareness.

When another editorial pops up denouncing millennials for some perceived generational flaw, I take it with a Miley Cyrus-sized grain of salt.

Walking in the morning improves my whole day. I think more clearly, my points of view are sharper, and I'm more decisive.

Exploring emerging technologies like new refraction technology will enable people to get prescriptions cheaper and more conveniently, which will, in turn, provide increased access to prescription glasses.

At Warby Parker, we use the survey platform Culture Amp to take employee engagement surveys that help us become ultra-responsive to the needs of our teams.

Creativity is a business imperative.

Share your personality with interviewers, but keep a professional filter safely adhered to it.

I wanted to open up a stand to sell dried fruit and beef jerky where we lived in Greenwich Village. I was 8 years old. I had been flipping through TV channels and got mesmerized by this infomercial for a food dehydrator.

I want to go at least 11 hours without food. I sat next to Hugh Jackman at a conference, and he told me he fasted 12 to 14 hours when he was training for the Wolverine movies. I've deluded myself into thinking I can effortlessly achieve the same body type as Hugh Jackman if I keep up this eating schedule.

We have been very focused on eyeglasses in particular because it's a massive industry.

Self-aware employees make a self-aware company.

If faced with two competitive candidates, every company will hire the person who evinces more enthusiasm.

Theoretically, an open-plan office is a great format for a changeable work environment, a place where employees have a say over how they work and a place that can adapt to their needs and to the needs of the business.

Giving employees agency over their workspace encourages them to think carefully about the conditions in which they work best, and it gives them the tools to forge that environment.

From the beginning, we believed that it was possible to develop direct relationships with customers at a relatively cheap cost, and our plan was to build a lifestyle brand that was also an Internet company - a rarity for eyewear.

Building a consistent experience and firm identity was instrumental in our ability to swiftly build our online presence, open four stores as well as a mobile store in a converted yellow school bus, and launch six shops-in-shops.

All those articles that scold Millennials for their supposed entitlement? Forget them. Millennials are great employees.

The basic idea of a hackathon is to erase all routine obligations for the day so that employees can clear a mental space for creativity.

The word 'hackathon' was born out of 'marathon' for a reason. It's exhausting.

Hackathons are an amazing way to engage the team, foster collaboration, and knock out great work.

One of my favorite products at Warby Parker also happens to be our worst-selling item: the monocle.

In general, obsolete technology is obsolete for a reason. Monocles are no exception.

Millennials in particular get a lot of flack for their supposed entitlement and narcissism, but these evaluations have never matched my experience with hiring young people at Warby Parker.

We've built a company that distributes a pair of eyeglasses to someone in need for every pair sold; that purchases carbon offsets; and that hosts mentoring programs at the office.

I believe that the concept of 'design' encompasses every aspect of customers's exposure to a brand, from the moment they hear about us to the first time they visit our store to the process of ordering and anticipating the arrival of their glasses.

Warby Parker designs experiences, not products.

One of the core values of the startup world is that you must have a list of core values. Like all abstract ideas, they're easy to dream up and tricky to implement.

When we were creating Warby Parker, for us it was about having a positive impact on the world and having a strong social mission.

What happens when kids don't have glasses - they get bored in class. They disengage and they may be disruptive. They may be misdiagnosed for A.D.D. or put in special needs classes.

Often, companies are trying to chase growth and get into other categories or go international too quickly, and they can get in trouble doing that.

Brands are only powerful if they're real and authentic.

The rules of optical dispensing vary from state to state. Dispensing eyeglasses is not that complicated, and even if it were complicated, there should be uniform rules.

We have never met with politicians. I don't know the first thing about how to get heard. My suspicion is that it's to donate a lot of money.

If you peek behind the curtain at any type of company, you'll see that things are far less organized than you'd expect.

I'm not as smart as I think I am.

Florence Nightingale. She is one of the most dynamic social entrepreneurs in history.

Successful entrepreneurs are pretty methodical about the problem they're trying to solve.

For every Mark Zuckerberg and Facebook, there's 30 other entrepreneurs that started their business after working for several years.