Police released surveillance photos of the person they want to speak with.
Officers said the man grabbed at two women in separate incidents at 10:15 a.m. Saturday in the 1100-block of South State Street and on at about 10:15 a.m. on June 1 in the 400-block of West Lake Street.
He was seen wearing sunglasses, blue polo shirt, and blue jeans and was riding a one-wheel motorized skateboard.
Anyone with information is asked to call police.