Johan Jacobsen

Johan Jacobsen (ヨハン・ヤコブセン) is a zoologist and an international authority on endangered species. He was an academic friend of Dr. Madnar during their college years. He worked as vice chairman for the Society for the Prevention of Cruelty to Animals and has also served as a biology adviser for Maxwell magazine. During Operation Intrude F014, he was near Zanzibar Land, conducting research on the desert wildlife of the Middle East. Solid Snake learned his frequency from Dr. Madnar during his mission and often came in contact with him when dealing with animal matters.

Behind the Scenes
Jacobsen was originally named Yozef Norden (ヨゼフ・ノルデン) in the original MSX2 version of Metal Gear 2: Solid Snake. His name was changed to Johan Jacobsen when the game was ported to mobile phones in 2004 and it's the name currently used in the series' canon.