I have 30 years of experience, and specialize in the field of reproductive biology with specific knowledge in the areas of male reproduction, reproductive toxicology and stem cell biology. I have published on such topics as spermatogenesis, fertility and estrogen and male reproduction. Since 1990, I have given 89 invited lectures, of which 49 were presented in 14 different foreign countries. I serve on 5 Scientific Journal Editorial Boards. Since 1995, I have consulted with over 20 different pharmaceutical and chemical companies.