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Hi and Welcome!During my 40+ years career as a Laser Optics scientist/engineer, Information Technology Specialist and programmer I used to apply mathematics on a daily basis. I was born in St.Petersburg (former Leningrad) where I got MS in Optical Engineering and PhD in Applied Mathematics and Physics. Since 1993 I have been living in the USA, where I continue my professional activity. I also conduct private tutoring to share my knowledge, to teach, mentor and coach preschool, elementary, mid