Yakov Freydenzon - My family line

As it appears, my great grandfather was born in Mariupol, current territory of Ukrain, having multiple names, last known Zahar Freydenzon. He was a chief manager of SoyusAsbest and executed based on promparty trial early 1941. My grandfather, Eugene (yevgeniy) freydenzon was a prominent metallurgist of Soviet Union. My father, Mark Freydenzon is alive and remaining a prominent metallurgist (although most of his business in information technology). My grandfather, father and uncle are in a list of "who is who" in Russian metallurgy. My name is Eugene Freydenzon and I live in Phoenix, Az; main occupation is information technology. My daughter is Anna Freydenzon, currently a student of ASU with bioengineering major