Nargeolet is the director of a deep ocean research project dedicated to the Titanic.

Source: https://www.citizen.co.za/news/debris-discovered-titanic-missing-sub-search-us-coast-guard/

OceanGate CEO and pilot Stockton Rush was killed in the implosion along with two members of a prominent Pakistani family, Shahzada Dawood and his son Suleman Dawood; British adventurer Hamish Harding; and Titanic expert Paul-Henri Nargeolet.

Source: https://chicago.suntimes.com/2023/6/28/23777795/human-remains-have-likely-been-recovered-from-the-titan-submersible-wreckage-u-s-coast-guard-says

Shahzada Dawood and his son Suleman died alongside Paul-Henri Nargeolet, Stockton Rush and Hamish Harding.

Source: https://www.independent.co.uk/news/uk/paulhenri-nargeolet-shahzada-dawood-rush-christine-stockton-rush-b2362780.html

The company conducted eight research and recovery expeditions between 1987 and 2010, according to its website, and Mr. Nargeolet has taken part in over 35 dives to the wreck site.

Source: https://www.nytimes.com/2023/06/19/us/missing-submarine-titanic-who-is-on.html

The other people on board were: OceanGate Expeditions founder and CEO Stockton Rush, British billionaire Hamish Harding, and renowned French diver Paul-Henri Nargeolet.

Source: https://www.bucksherald.co.uk/news/tributes-after-former-university-of-buckingham-student-and-son-died-on-titanic-submarine-4195051

The others on board were two members of a prominent Pakistani family, Shahzada Dawood and his son Suleman Dawood; British adventurer Hamish Harding; and Titanic expert Paul-Henri Nargeolet.

Source: https://gazette.com/ap/the-titan-submersible-imploded-killing-all-5-on-board-the-us-coast-guard-says/article_8a7a03ea-587e-56c8-80e9-e66ecc0e72e6.html

Titan submersible passengers (clockwise from top left): explorer Hamish Harding, OceanGate Expeditions CEO and founder Stockton Rush, Shahzada Dawood and his son Sulaiman Dawood; and Titanic expert Paul-Henri Nargeolet.

Source: https://nypost.com/2023/06/22/titan-submersible-implosion-likely-so-fast-victims-never-knew-expert/

We now believe that our CEO Stockton Rush, Shahzada Dawood and his son Suleman Dawood, Hamish Harding, and Paul-Henri Nargeolet, have sadly been lost.

Source: https://gcaptain.com/debris-field-found-in-search-for-missing-titan-sub/