When Jonathan Neman was a student at Georgetown in the mid-2000s, he and some friends wanted to start a restaurant. A fast-food restaurant, but it would be healthy. And cool.

The documentary “Super Size Me” had made waves, and “we were going to be rejecting the fast food of the previous generation,” Mr. Neman said.

He and his business partners, Nicolas Jammet and Nathaniel Ru, opened the first Sweetgreen in 2007, on the edge of campus on M Street in Washington. As they expanded, they decided against franchising the brand, keeping control of every new location. Soon it became a buzzy millennial lifestyle brand. It sponsored an annual music festival. It went public in late 2021.

Sweetgreen now has more than 250 restaurants across the United States. The chain is known for its endlessly customizable salads — and for how quickly the cost of all those extra toppings and dressings can add up. (A recent lunch there cost me $16.28.)

The company also runs a growing number of locations that include what it calls the Infinite Kitchen, with salad-slinging robots that assemble bowls faster than human workers.

With great fanfare, Sweetgreen recently put fries on its menu — air-fried in avocado oil, to make customers feel better about adding a side of carbs to a salad. Much of its food is sourced locally, including avocados from California, which will limit the hit the company takes on tariffs, executives have told investors.

And Sweetgreen doesn’t cater just to office workers eating salads at their desks. Mr. Neman, 40, said he had heard that teenagers were “obsessed” with the salads, which wasn’t the case when Sweetgreen started. “The fact that they think that eating healthy is cool is something that we envisioned,” he said at his office in Los Angeles, where the company is now based.

Back in Washington, the Trump administration is also thinking about what goes into food. Health Secretary Robert F. Kennedy Jr., the standard-bearer of the “Make America Healthy Again” movement, recently declared that “sugar is poison” and pushed to ban artificial dyes in foods.

Some of those aims resonate with Mr. Neman, whose company worked with the former first lady Michelle Obama’s “Let’s Move” campaign. But he — like many other company leaders — is trying to talk about the company’s priorities (like eliminating seed oils) without being pulled into the polarized politics of the moment.

“We say we’re not red or blue, but we’re green,” he said.

This interview was condensed and edited for clarity.

Sweetgreen is all about healthy ingredients. Now, there is the “Make America Healthy Again” movement and R.F.K. Jr. pushing to ban artificial dyes in food. What are your thoughts on that?

As it relates to “Make America Healthy,” funny story: In 2016, during a festival, we had a campaign that was a joke, a play on “Make America Great Again.” We made “Make America Healthy Again” hats.

Wow.

We are on the team of anyone who wants to help make America healthier. Back in the days of the Obama administration, we partnered very closely with Michelle Obama.

With R.F.K. Jr., I’ll speak to the parts related to our world. I think bringing more transparency to our food system is great. I think some of those dyes are bad. Sweetgreen has never sold soda very intentionally. We’d make a lot more money if we did. A lot of people wish we did. We never have and I don’t think ever will.

We don’t like to get involved in the rest of it. So we’re not trying to insert ourselves politically, either me personally or as a brand.

Have you communicated with the White House about healthy foods?

We haven’t been directly involved at this point. But if there’s a place for us to help, we’re totally up for it.

There have been cuts at the Food and Drug Administration, which oversees food safety. Do you have any concerns around food safety in the U.S. right now?

I think some of the things I’ve seen could be a little bit alarming. Others seem great.

What are the things that concern you?

I’d want to be careful to have certain guardrails around food safety, for example. And to be careful that there are not any adverse impacts to moving too fast. But overall, I think more transparency around the food system, promoting more real food, getting rid of these artificial chemicals that are allowed in our food and removing any conflicts of interest in people that are regulating our food are all good things.

Let’s talk about the robots. Will they help with profitability?

Absolutely. So what we’ve seen is at the store level, the Infinite Kitchen adds at least seven points of margin. So if you look at our store, right now we’re about a 20 percent margin business. An Infinite Kitchen store should be at least seven points better.

So as more robots make more salads, can people expect prices to come down?

We are very conscious of making sure that Sweetgreen can be something for everyone. I think automation does give us a hedge as labor costs continue to go up, to be able to drive more value and offer that to our customer.

How much is too much to pay for a salad?

It really depends what you put in it. When you think about the cost of something, you have to sometimes think about the total cost. There’s the cost to you, but when you eat certain things, what’s the cost to your health? What’s the cost to the environment? People are paying not only for the quality of the taste in the food, but the fact that it’s made by hand, the fact that we pay our farmers and our team members fairly.

What’s your back story? Tell me about your parents and growing up in Los Angeles.

My parents immigrated here in 1979. They were Iranian Jews who came during the revolution. And that was a big part of my story growing up because I think about how fragile your life and reality can be.

I’m the oldest of four boys. Being Jewish is a big part of my identity. I’ve always been very connected to Israel and my Jewish faith and big family.

My dad has four siblings. They each have four kids, so 20 cousins. Shabbat every Friday. A lot of us Persian Jews came to Los Angeles during that time.

Entrepreneurship is really a part of the culture. Growing up, I knew very few people who worked for big companies. Everybody was a small-business owner in some way. My dad and his brothers worked together. They started a textile business.

I always knew I wanted to be in business. From a very early age my dad would take me to work with him. One of my earliest memories was that I’d want to put on a suit — because he put on a suit — and go to his factory and walk around.

You had this great network of entrepreneurs during the start-up process. Were you calling your dad?

I had a lot of mentors in the community, including my dad. Always was and still is. I always give my dad a lot of credit because I don’t think he expected me to go to Georgetown and then to, like, start a little salad shack.

What was it like to be an entrepreneur in Washington at that time?

Entrepreneurship has become a lot sexier over the past 20 years. At the time, especially at Georgetown, that wasn’t the culture. The cool thing was going to get a job in government or consulting or banking.

I got accepted to what I thought was my dream job, at Bain & Company, the consulting firm.

I would have had to leave D.C. The restaurant was up and running. I spoke to my partners, like what should I do? Should I stay? Should I go? They’re like, “It’s one restaurant now. Why don’t you go and get these skills and then see what happens?” I went and realized consulting wasn’t really for me, especially after being an entrepreneur.

Finally, it was actually a conversation with someone at Bain. I always remember this conversation because he’s like: “Listen, you have two big opportunities to take huge risks in your life. One is now. The other is after your kids are out of school. You don’t have anything to worry about right now.”

I remembered this phrase: “You can’t fall from the floor.”

Time for the lightning round. Do you have any secret Sweetgreen menu tips?

The big unlock to the secret menu is the mixing of dressings. Putting two together, like spicy cashew with a green goddess. You have this whole different experience.

Do you use A.I.? If so, what was the last question you asked a bot?

I do use A.I. a lot. The last thing I did was not a work thing. It was personal. I have two kids, a 2-year-old and a 4-year-old. I put a picture of them in and asked what they’re going to look like when they grow up. It has blown my mind because I can’t unsee it now.

What other C.E.O. do you admire?

I’d always looked up to Howard Schultz. I think what he did at Starbucks was amazing.

Do you work on a plane, or do you zone out?

I work a lot on the plane. It’s this amazing quiet time where I can do a lot of the work that I can’t do day to day.

How do you sign off your emails?

Usually just “JN.” If it’s a more inspirational message, I’ll write, “Onward.”

Days before the Titanic struck an iceberg, a first-class passenger, Col. Archibald Gracie, described the vessel in a letter written while on board: “It is a fine ship but I shall await my journey’s end before I pass judgment on her.”

Colonel Gracie’s journey on the Titanic had a catastrophic end, but he fared better than most.

He was on the top deck of the ship, gripping a railing, as it plunged into the sea. He said he was “swirled” under water before he got to a raft, where he spent hours floating on icy waters before being rescued.

The letter he wrote was sold on Saturday at an auction for $399,000 (or 300,000 pounds), according to Henry Aldridge and Son, an auction house in Wiltshire, England.

The auction house said the letter, written in neat, cursive handwriting, was addressed to an unidentified European ambassador, the great-uncle of the seller. The letterhead shows a triangular red flag with a white star and is printed with the words “On board R.M.S. Titanic.”

The letter was dated April 10, 1912, the day the ship set sail from Southampton, England. On April 12, it was postmarked in London, where it was received at the Waldorf Hotel. The Titanic struck an iceberg just before midnight on April 14 and sank the next day.

The buyer of the letter was based in the United States, according to Andrew Aldridge, the managing director of Henry Aldridge and Son. The auction house did not publicly identify the buyer or the seller.

Mr. Aldridge said in an email that the stories of the ship’s passengers “are told through the memorabilia” and that “their memories are kept alive through those items.”

The auction house had initially expected the letter to sell for up to 60,000 pounds, or nearly $80,000.

Colonel Gracie, a graduate of the United States Military Academy at West Point, was a high-profile survivor of the Titanic disaster, in which about 1,500 people perished.

He died eight months later, in December 1912, of complications from diseases, but his doctors and his family said that the real cause was that he had never recovered from the shock of the Titanic disaster, according to The New York Times.

After Colonel Gracie was rescued, he began work on “The Truth About the Titanic,” a book about his experience that was published posthumously. The New York Times review of the book said “there is something effective in the very lack of directness and coherency in the narrative.”

Colonel Gracie said in an interview with The New York Tribune that he had been on the top deck of the ship when it was hit by a wave that sent other people overboard. He managed to stay on and grabbed a brass railing.

“When the ship plunged down, I was forced to let go, and I was swirled around and around for what seemed an interminable time,” he said. “Eventually I came to the surface to find the sea a mass of tangled wreckage.”

He said he grabbed a wooden grating and then saw a canvas-and-cork raft. He made it onto the raft and began trying to rescue others. They eventually reached a rescue ship, R.M.S. Carpathia.

“The hours that elapsed before we were picked up by the Carpathia were the longest and most terrible that I ever spent,” Colonel Gracie said, according to The Tribune. “Practically without any sensation of feeling because of the icy water, we were almost dropping from fatigue.”

Colonel Gracie was an established figure in New York and Washington society.

His father had been an officer in the Confederate Army during the Civil War. Colonel Gracie was also a descendant of Archibald Gracie, who built the New York City mayor’s official residence, Gracie Mansion, in 1799.

After news of the Titanic’s sinking reached the United States, and it was not known whether Colonel Gracie had survived, his wife, Constance Schack Gracie, was reported missing for unrelated reasons.

Mrs. Gracie had not been on the ship, but had left town to avoid being subpoenaed in the lunacy trial of another society woman, Mary E. Gage, according to The New York Times.

In the days after the Titanic disaster, the Gracies’ daughter, Edith Gracie, was asked about the whereabouts of her mother, which she said she did not know, and about the fate of her father, The Times reported.

She said Colonel Gracie had been in Europe recuperating from an operation and had said in a letter that he would return home with a much stronger constitution.

“It is too terrible to think of,” she said, “but I am hoping against hope that he has come through the perils of the accident without harm.”