The paper presents the position of agricultural engineering in the United States as a scientific discipline, a field of academic education and its participation in innovation transfer to agrifood sector. The decreasing number of students and financial resources for agricultural research in the United States enforces transformation in agricultural engineering. Such changes are oriented mainly on extending the area of interest and permanent updating of research topics based on the requirements of farmers and manufactures of agricultural machines. The area of expertise of agricultural engineer-ing in the U.S. is changing towards rather biological than technical issues, that is engineering of biosystems. That should be also our guiding direction of future transformations. The American system RET (research, extension, teaching) should be the model for the inevitable transformation of the Polish agricultural engineering. The system is a source of inspiration for science and effective tool for the transfer of innovation into agrifood sector. It also facilitates the process updating teachers’knowledge and promotes improvement of academic education.