Dr. Kevin Kirby is a podiatrist who received his DPM from the California College of Podiatric Medicine in San Francisco in 1983.  He has written extensively on several podiatric related subjects (foot orthotics, biomechanics, …). In 1997, he authored his first of 2 books, “Foot and Lower Extremity Biomechanics: A Ten Year Collection of Precision Intricast Newsletters“, and in 2002 – “Foot and Lower Extremity Biomechanics II: Precision Intricast Newsletters, 1997 – 2002” available at Precision Intricast Inc..  Next to this he’s a pioneer in making the average podiatrist think about the basic engineering principles in the podiatric biomechanics. 
He wrote already up to 9 Thought Experiments on Podiatry Arena, the cradle of the in-depth podiatric discussions, already good for a dazzeling 11200 hits and counting…  Here they come!
T.E. #1: Tie Tensile Force in Loaded Arch
T.E. #2: Effect of STJ Axis Location on Met Head GRF
T.E. #3: Effect of STJ Axis Location on PT Muscle Tension
T.E. #4: Effect of STJ Axis Location on Sinus Tarsi Compression Forces
T.E. #5: Effect of Foot Orthoses on Sinus Tarsi Compression Force
T.E. #6: Effect of Foot Orthoses on PT Tendon Force Required to Cause STJ Supination
T.E. #7: External Forces on Objects: Problems with Only Motion Observation
T.E. #8: Multiple Joint Moments from CoP
T.E. #9: Simultaneous Ankle and STJ Equilibriums