Horst Feistel wrote this article and published in Scientific American in May 1973 (Volume 228, No 5). It explains the importance of encryption for data protection.

46 years after this article, Alan Konheim, the founding Chair of the UCSB’s Computer Science Department wrote an article on Horst Feistel in the Journal of Cryptographic Engineering of which I am the Editor-in-Chief.
Alan’s article’s link in the Journal (April 2019, Volume 9, Issue 1):
https://link.springer.com/article/10.1007/s13389-018-0198-5

Alan Konheim was my professor when I was a graduate student at UCSB. Alan died in 2019, may his soul rest in peace.

The first sentence of the JCEN article’s Acknowledgement section writes:

“I am particularly grateful for the assistance given by my former UCSB student and later colleague Çetin Kaya Koç, editor-in-chief of the Journal of Cryptographic Engineering, who invited the submission of this paper,”