Selected Figures from Henri's Journals

• Louis Agassiz – Swiss-American zoologist, glaciologist, and geologist.
• Aimé Louis-Victor du Bosc, Marquis de Radepont – Would later become diplomat for Emperor Louis Napoleon III.
• Louis-Hector Galard-Brassac, Comte de Béarn – Diplomat and Member of the French Legation in Washington D.C.
• Asa Gray – Considered the most important American botanist of the 19th century.
  
• Arnold Guyot – Swiss-American geologist and geographer.
  
• John Edwards Holbrook – American zoologist, physician, and naturalist.
  
• Don Manuel Ijurra – Peruvian government appointed head of expedition to found the town of Caballococha in the Amazon river basin.
  
• Leo Lesquereux – a Swiss bryologist and a pioneer of American paleobotany.
  
• Francis de Palezieux-Falconnet – Agent of the Committee of Mexican Bond holders.
• Louis François de Pourtalès – Swiss-American naturalist.
  
• Baron Damian von Schütz – Second in command of the expedition and leader of the first wave of German emigrants to Peru.
  
• William Starling Sullivant – US bryologist.