Invincible Defense Technology Is the Ultimate Homeland Security Strategy

How do we stop war, prevent terrorism and make our homelands secure? How can we achieve invincibility? There is a scientific solution for a strong military that is a nonlethal approach to achieve this goal. It is called Invincible Defense Technology (IDT). Invincible: Incapable of being defeated. Unconquerable. Invincible Defense Technology is the best solution for a strong national defense:

  • Scientifically studied and field-tested
  • Quietly demonstrated in conflict-prone regions
  • Non-religious, nonpartisan
  • Easy to implement
  • The ultimate approach for conducting operations other than war (OOTW).

Dr. Carla Linton Brown’s Harvard University doctoral dissertation on attitudes about Invincible Defense Technology

Observing the Assessment of Research Information by Peer Reviewers, Newspaper Reporters, and Potential Governmental and Non-Governmental Users: International Peace Project in the Middle East Carla Linton Brown.

A Thesis Presented to the Faculty of the Graduate School of Education of Harvard University in Partial Fulfillment of the Requirements for the Degree of Doctor of Education [read more]

For more information, navigate this site using the links on the right. For answers to questions, email David Leffler, Ph.D. at

Read the archived issues of Invincible Defense Technology News.

Is your country invincible? Try the Square Root of One Percent of the Population Calculator.

Personal Message for Musicians from Dr. Leffler
Featuring Links From His Musical Pursuits:

First, this special message is to all my military-related friends. I made many friends when I spent nine years as an instrumentalist traveling worldwide with US Air Force Bands. Years later, my musical talents still come in handy making new friends.

For example, in Seoul, Korea I presented my scientific paper about Invincible Defense Technology at the “International Sociological Association Research Committee 01 Seoul National University & Korea Military Academy International Conference on Armed Forces & Conflict Resolution in a Globalized World.”

While meeting with military leaders and scientists at the Officers Club in the DMZ, I sat in playing the bass guitar. Here is a YouTube video titled: Dr. David Leffler Jams with South Korean Army Divisional Band.

Last summer, my wife jazz violinist Arlene Schar Leffler and I attended the Jamey Aebersold’s® Summer Jazz Workshops. Afterwards we visited our friends in Fairfield, Iowa and put on reunion concerts of the Dave Leffler Quartet. Click here for an online video from one of our concerts.

I do not expect band leaders interested in hiring me as a sideman to listen to all content of this video as well as the others listed below. To save time, I am listing parts where I solo. My piano solo on “Autumn Leaves” starts at 2:29.

When I lived in Iowa my jazz band The Dave Leffler Quartet (DLQ) was an opening act at FAIRfest. Here is a fifteen second clip (our group appears at 1:55) of us playing the song “Wave” by the Brazilian composer Carlos Jobim.

I played mostly keyboards and sometimes guitar with the DLQ. Once when our bass player was out of town,  I played bass guitar for a gig and brought in guest artists to fill in on keyboard as well as a new drummer/vocalist for the second set. Here are two songs selected from both sets:

Dave Leffler Quartet with Phil D’Agostino piano, Dave Leffler bass guitar, Steve Jeffries drums, Bill Vesely flute. Selection: “On A Clear Day.” I have a bass solo on this tune at 1:45 into the selection.

Combined Dave Leffler Quartet / Ron Dean Trio with Ron Dean piano, Dave Leffler bass guitar and vocal, Ira Goldberg drums, Steve Jeffries soprano sax, Bill Vesely flute. Selection: “Nature Boy/Girl.” 

The Dave Leffler Quartet (guitar single line and chord solo at  3:15) played at the Sondheim Center for the Performing Arts after a David Lynch (the movie maker) Foundation Veterans seminar and also for a Veterans’ Benefit Concert (my piano solo at 2:12).

I earned a Master of Music and am a multi-instrumentalist who plays keyboards, guitar, bass guitar, and percussion, When not lecturing or writing about Invincible Defense Technology, I may be able to sub for musicians in the Austin, Texas area. If interested, please email me at:

Site Map |