|Yakov Borisovich Petrov|
|Kanji/Kana||ヤーコフ・ボリソヴィッチ・ペトロフ (ペトロフ 博士)|
|Partner Digimon||Rize Greymon|
|Digimon Used||Metal Greymon|
|Family||Nicolai Petrov (son)|
|Voice Actor||Kuroda Takaya (黒田 崇矢)|
He is an academician and works in the GIGO Company.
While Professor Petrov does not appear directly in the manga, he's mentioned several times.
After the Digital Monsters MMORPG went down in "Digital Monster", Taiga asked Nicolai Petrov if his father, a research technician at GIGO Company, had told him anything about it, but Nico answered that he was too busy with work to even come home. He then explained that GIGO Company had a monopoly on the world's wireless industries, and wondered if the network acting up and his dad not coming home were caused by a GIGO mistake, though he quickly said it was a joke.
Mikagura Mirei's independent investigation on servers that had suddenly gone down without explanation a few years ago and GIGO Company being the only one to succeed in maintaining their systems and make rapid progress afterwards led her to a certain mystery: Project Vitium, which GIGO had triggered the incident with, according to the fragmented records that remained on GIGO's server, and the man leading it was Professor Yakov Petrov, who had mysteriously disappeared according to records of the project. Mirei thought only the doctor's whereabouts could give her the truth.