Diagnostic congenital cardiac catheterization; Interventional congenital cardiac catheterization - intravascular stents; endomyocardial biopsy, balloon valvotomy; radio frequency ablation/perforation of atretic valve or vessels, vessel embolization; Percutaneous catheter device closure of atrial septal defects, ventricular septal defects, patent foramen ovale, and patent ductus arteriosus. Currently is an investigator at Mayo for the Respect trial for PFO closure in stroke patients. The Premium trial for PFO closure in patients with severe Migraine headache also has been approved and currently can enroll patients. We plan to participate in a drug trial to evaluate the use of Clopidogrel to lower arterial thrombotic risk in neonates and infants. Echocardiography, fetal echocardiography, transesophageal and intracardiac echocardiography; Complex congenital heart disease is a particular interest in view of Mayo's long history of surgical repair of congenital cardiac defects.