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This as-told-to essay is based on a conversation with Oliver Kharraz, the 53-year-old CEO and cofounder of Zocdoc, based in New York City. It's been edited for length and clarity.

During college, I built my first company. I provided internet access to a few local companies and offered data storage and remote access solutions. I had the choice to either drop out of college and make it internet-ready or sell it. I sold it in 1994.

I then spent seven years at McKinsey as an associate principal, which was great training for me — it was sort of a prelude to some of the things I had to do at Zocdoc later. I worked at the Munich office, then transferred to the New York office in 2004.

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I started Zocdoc, an online service that lets people find and book in-person or telehealth appointments for medical or dental care, in 2007 with two cofounders, one of whom I met at McKinsey. We were in the process of starting several companies and discussing our personal experiences with the healthcare system. As we talked, it became clear to us that this was a better opportunity than what we were pursuing separately.

I grab my phone and look at the company numbers. I have several reports that the system automatically sends, so they're waiting in my inbox. I look at our KPIs, and if something looks off, I might shoot off a couple of questions to the team. I frequently send those out with an 8 a.m. timer, so people don't get scared about why the CEO sends emails in the middle of the night.

I find that setting aside time in the shower to process the information I've taken in over the last 24 hours is helpful. I take long, warm showers, nearly in sensory-deprivation mode. I think the main job of the CEO is to be a bit of an oracle, predicting the future.

I would say I make breakfast half the time, and my wife makes it the other half. I'm increasingly skipping carbs and choosing Greek yogurt, nuts, seeds, and maybe some berries. The rest of the family still eats bread, and so there's bread, butter, honey, jam, and eggs.