Senator Chuck Grassley of Iowa has widened his investigation into well-known Harvard child psychiatrist Dr. Joseph Biederman, questioning whether Biederman promised pharmaceutical giant Johnson & Johnson that his research into the company's drugs would yield positive results before beginning the studies.

A prominent child psychiatrist, already embroiled in two other controversies, told Johnson & Johnson that planned studies of its medicines in children would yield results benefiting the company.

A prominent child psychiatrist, already embroiled in two other controversies, told Johnson & Johnson that planned studies of its medicines in children would yield results benefiting the company.

A prominent child psychiatrist, already embroiled in two other controversies, told Johnson & Johnson that planned studies of its medicines in children would yield results benefiting the company.