Ninjutsu, as a martial art, has evolved, and there are contemporary practitioners who have gained recognition. However, it’s important to note that modern practitioners often focus on aspects like self-defense, fitness, and historical preservation rather than the espionage and sabotage tactics associated with historical ninja. Here are a few individuals known for their expertise in modern ninjutsu:

1. Masaaki Hatsumi (初見 良昭):
   • As the founder of the Bujinkan organization, Hatsumi is a prominent figure in the world of modern ninjutsu. He has trained martial artists worldwide in a variety of traditional Japanese martial arts, including ninjutsu.
2. Stephen K. Hayes:
   • An American martial artist, Hayes played a significant role in popularizing ninjutsu outside Japan. He trained under Masaaki Hatsumi and has been influential in spreading the teachings of Bujinkan Budo Taijutsu.
3. Dr. Kacem Zoughari:
   • A martial artist and academic, Zoughari has extensively studied Japanese martial arts, including ninjutsu. He is known for his research, writings, and teachings on the historical and cultural aspects of martial arts.

These practitioners have contributed to the modern understanding and practice of ninjutsu, adapting its principles for contemporary martial arts applications and emphasizing its cultural and historical significance. They based their art on and studied from historical ninja legends.