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While Leo’s most cherished activity was his academic research, he was also sought after and highly recognized for his teaching activities. In this context, he offered primarily graduate courses on basic aspects of propagation, scattering, and guiding of waves. In these courses, his approach was to deftly combine mathematical rigor with models of actual applications while at the same time emphasizing the strengths and weaknesses of various methods. He made a point of stressing the elegance and utility of canonic problems; he clearly presented the latest state-of-the-art techniques and indicated the principal as-yet-unsolved problems. Most importantly, his course assignments were actually mini-projects whose basic aspect and treatment often served as a prelude to M.S. and Ph.D. dissertations. Needless to say, those courses turned out to be an inspirational source to many of his students, as well as to colleagues with interest in wave phenomena.

Perhaps most impressive was Leo’s heroic achievement in living a full and productive life after being stricken by his unforgiving and progressive muscular illness. He did not just stoically accept a debilitating situation, but he adroitly accommodated his daily activities and scientific pursuits so as to continue taking full advantage of his brilliant intellectual capacity. It is simply amazing that he was able to continue until his death a distinguished professional career, both working on his own and in collaboration with many others. By adding to this a piquant humor and charming his friends with insightful verses that he composed for many odd occasions, Leo was an inspiration to all his professional peers as well as to his younger colleagues.

A few of Leo’s additional sides: In his earlier years, he was an avid hiker, and remained a lover of nature, and especially the mountains, throughout his life. He was a true humanist; he appreciated and respected the many cultures found around the globe and knew that he was fortunate to have had the opportunity to experience so many of them firsthand, through his wide professional travels and his diverse relationships with students and colleagues. He very much enjoyed following the



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