·      Aug., 1987, IBRO Meeting, Budapest, Hungary, Invited Speaker

·      Sept., 1987, Fall Retreat of the Neuroscience Training Program, University of Pittsburgh, Pittsburgh, Pennsylvania, Invited Speaker

·      Jan., 1988, Winter Conference for Brain Research, Steamboat Springs, Colorado, Invited Speaker.

·      May, 1988, Symposium on Spasticity, University of Virginia, Invited Speaker

·      Nov., 1988, Symposium on Spinal Cord Plasticity, Allegheny General Hospital, Pittsburgh, Pa, Invited Speaker

·      Nov., 1988, Symposium on Development of Functional Heterogeneity Among Sensory Neurons, Society for Neuroscience, Toronto, Invited Speaker                                              

·      January, 1989, Winter Conference for Brain Research, Snowbird, Utah, Invited Speaker

·      May, 1989, Symposium in honour of Professor P.D., Wall, F.R.S., Woods Hole, Mass, Invited Speaker

·      Oct., 1989, Symposium on The Segmental Motor System, Tucson, AZ Organizer and participant

·      Jan, 1990, Panel on Plasticity at the Ia synapse:  New use for a classic model. Snowmass, CO, Invited Speaker  

·      April 1990, Session on Pain in Childhood, International Association for the Study of Pain, Adelaide, Australia, Invited Discussant

·      June 1990, International Society of Developmental Neurobiology Meeting, Miami, FL, Invited Speaker

·      Sept., 1990, Symposium on Motoneuron Plasticity, Bonn, FRG, Invited Speaker                                  

·      Jan., 1991, Panel on quantal transmission at central synapses, Winter Conference for Brain Research, Vail CO, Invited Speaker                                            

·      May 1991, First Annual Meeting of Canadian Network on Recovery of Function, Montreal, Canada, Invited Plenary Speaker                                       

·      Aug., 1991, Workshop on Computational properties of motoneurons, IBRO meeting,. Montreal, Canada, Organizer and participant

·      Sept., 1991, Symposium on Formation and Regeneration of Nerve Connections, Edinburgh, Scotland, Invited Speaker                                                   

·      Dec., 1991, Symposium on Artificial and Natural Intelligence. Jalapa, Mexico, Invited Speaker

·      June 1992, Spring Symposium on Neuronal Plasticity. Neuroscience Program, University of California, San Francisco, Invited Speaker                                                  

·      Oct., 1992, Society for Neuroscience meeting, Anaheim, CA, Special lecture (plenary)

·      March 1993, Symposium on Sensory Ganglion Cells, Wye College, UK, Invited Speaker and Session Chair

·      May 1993, Symposium on Peripheral Inflammation held at the Royal Society, London, UK, Invited Speaker                             

·      Aug., 1993, Nerve Growth Factor and Pain, International Association for the Study of Pain meeting, Paris, France, Invited Organizer and Speaker

·      Feb., 1994, US- Mexico Research Development Workshop, Cuernavaca, Mexico, Invited Speaker

·      June 1994, Third International Congress on Pediatric Pain, Philadelphia, Invited Symposium Speaker

·      July, 1994, Symposium on Function of Alpha and Gamma Motoneurons,  London, UK, Invited Speaker

·      May 1995, 10th Annual Applied Neural Control Research Day, Case Western Reserve University, Cleveland, OH, Invited Speaker

·      June 1995, Symposium on Presynaptic Inhibition, Guanajato, Mexico, Invited Speaker

·      June 1995, Symposium on Sensorimotor Mechanisms, Kingston, Ont., Canada, Invited Participant

·      July, 1995, U.K. Physiological Society, Sensorimotor Control Interest Group, Plenary lecture