Dr. Pierson's research is multi-disciplinary and revolves around ovarian follicular development in natural cycles, ovarian stimulation, ovulation and ovulation induction, uterine receptivity and hormonal contraception. Dr. Pierson gave the medical and scientific communities the first ever visualization of human ovulation using ultrasonography in 1990. Subsequent studies on ovarian function in women by Dr. Pierson and colleagues at the University of Saskatchewan were heralded as one of the Top 100 scientific discoveries of 2004 by Discover magazine.