Throughout a 24-hour swing via Copenhagen final month, Eric Slesinger met with engineers making maritime drones, builders of war-planning software program and an adviser to NATO. He had not too long ago visited London for a dinner with a senior British intelligence official and would quickly head to the Arctic to study in regards to the applied sciences that might deal with excessive climates.

The packed schedule would appear extra widespread for Mr. Slesinger in his former job as an officer on the Central Intelligence Company. However now the 35-year-old was in excessive demand as he parlayed his spy company credentials right into a profession as a enterprise capitalist centered on the abruptly related space of protection and nationwide safety expertise in Europe.

“That is all taking place at warp velocity,” stated Mr. Slesinger, who has backed eight protection start-ups and has negotiated with a number of extra.

As President Trump throws the way forward for the trans-Atlantic relationship into query, governments throughout Europe have outlined plans to doubtlessly spend a whole bunch of billions of euros on weapons, missile-defense packages, satellite tv for pc techniques and different applied sciences to rebuild their armies. Technologists, entrepreneurs and buyers are racing to reap the benefits of the spending growth by creating new protection start-ups.

Few paid consideration a number of years in the past when Mr. Slesinger moved to Madrid with the concept Europe would want to drastically improve protection spending as a result of U.S. navy safety couldn’t be taken as a right. Now his predictions look prescient. After Mr. Trump’s inauguration, which adopted his defeat of Vice President Kamala Harris within the November election, members of his administration referred to as Europe “pathetic” and navy mooches of the USA.

“Whether or not Trump received or Harris or anybody else, the actual fact would have remained that there’s a expertise catch-up that should occur in Europe,” Mr. Slesinger stated whereas strolling between conferences in Copenhagen final month. “Possibly it’s accelerated in sure methods, however this was a very long time coming.”

Mr. Slesinger is now within the uncommon place of a former American intelligence officer who’s attempting to revenue from Europe’s deliberate navy transformation. His one-man enterprise capital agency, 201 Ventures, is finishing a $22 million fund to spend money on younger start-ups on the intersection of tech and nationwide safety.

Mr. Slesinger’s preliminary investments embrace a maritime drone firm in Sweden, a maker of producing expertise in Britain, a synthetic intelligence agency in Greece and a hypersonic car start-up in Germany.

The US has a protracted custom of investing in protection — Silicon Valley was began partly with Pentagon funding — and has seen the rise of a number of military-centric start-ups, akin to Palantir and Anduril. Europe has had fewer successes, partly as a result of defense-related companies had been seen as so unethical that many buyers there refused to place cash behind them.

“There was this awakening second, and it’s going to lead to a dramatic improve in spending in protection, safety and resilience expertise,” stated Chris O’Connor, a companion on the NATO Innovation Fund, a 1 billion euro tech fund began with cash from 24 members of the North Atlantic Treaty Group, although not the USA.

The NATO fund is the largest monetary backer of Mr. Slesinger’s agency. Mr. O’Connor stated Mr. Slesinger’s nationwide safety expertise made him preferrred for figuring out corporations with tech that might win authorities contracts.

“He’s going to finish up taking part in a crucial function,” Mr. O’Connor stated.

Mr. Slesinger grew up simply exterior Washington, D.C., and attended Stanford. There, he was a standout within the mechanical engineering program, stated Craig Milroy, co-director of Stanford’s Product Realization Lab, the place college students can workshop {hardware} concepts.

Whereas a lot of Mr. Slesinger’s Stanford classmates explored jobs with Apple or Google, he regarded elsewhere. “He got here into my workplace at some point and stated, ‘I’m making use of to hitch the C.I.A.,’” Mr. Milroy stated. “That’s by no means occurred earlier than or since.”

Mr. Slesinger is cagey about his 5 and a half years working on the C.I.A. However together with his engineering background, he stated, he labored amongst extra Q-like figures from the James Bond movies, geeks working within the background to resolve technical issues for intelligence officers within the subject.

“Think about being a scholar, form of nerd engineer, and you then get to go on this place the place you’ve got like a Santa’s workshop-like functionality,” he stated. “Intelligence issues are actually onerous, they’re gnarly, and you are feeling an actual duty to do one thing to resolve the issue.”

In 2019, Mr. Slesinger stepped again from the company to attend Harvard Enterprise College. He additionally spent a summer season working for the C.I.A.’s enterprise capital fund, In-Q-Tel.

Round this time, he turned fixated on the concept Europe should rebuild its militaries after a technology of low funding. The US spent about $880 billion on protection in 2024, greater than double what different nations in NATO spent mixed.

With the USA centered on China, Mr. Slesinger was satisfied he would see the top of the so-called peace dividend, which has allowed European nations to spend extra on social providers and pensions since World Battle II, as a substitute of on tanks and fighter jets.

Russia’s invasion of Ukraine in 2022 additional crystallized his thesis. He then began the European Protection Investor Community, which now contains about 125 buyers, entrepreneurs and policymakers. Final yr, he began 201 Ventures.

At first, he struggled to boost funding as a result of many buyers refused to again navy applied sciences. However he ultimately raised cash from NATO and located advisers together with Eileen Tanghal, who used to supervise In-Q-Tel’s London workplace; David Ulevitch, a basic companion on the Silicon Valley enterprise agency Andreessen Horowitz; and the writer Sebastian Mallaby.

Over the previous 12 months, Mr. Slesinger, who additionally has an Italian passport from his household’s roots there, has traveled to fifteen nations. On a latest journey to the Arctic, he rode a snowmobile to a distant space being thought-about for testing new energy sources and a communication expertise. In Switzerland, he toured the world’s strongest particle accelerator.

In February, Mr. Slesinger was in Germany for the Munich Safety Convention when Vice President JD Vance delivered a blistering speech criticizing Europe. Inside weeks, Germany, France, Britain and different European nations pledged to vastly improve navy spending, alarmed that they may now not rely on the USA as a dependable ally.

“It felt like a sea change,” stated Mr. Slesinger, who watched Mr. Vance’s speech from a laptop computer at a close-by lodge. “You could possibly really feel it as he was talking.”

How a lot of the brand new spending will attain start-ups is unclear. Missiles, ammunition and fighter jets are prone to be greater priorities than tech from small, untested corporations.

Mr. Slesinger stated it might take years to measure success, however he expects to spend his $22 million fund within the subsequent two years and has already begun fascinated with elevating a bigger quantity. Prior to now few months, he has been peppered with pitches from European entrepreneurs abruptly focused on making navy tech.

For almost everybody he meets in Europe, there may be one nagging query: Is he actually now not working for the C.I.A.?

“I’m actually out!” he stated.