Exhibit 1
Joint Filing Agreement
The undersigned hereby agree that a single Schedule 13D (or any amendment thereto) relating to the Common Stock of OpGen, Inc. shall be filed on behalf of each of the undersigned and that this Agreement shall be filed as an exhibit to such Schedule 13D.

Dated: May 14, 2015
 
 
  HARRIS & HARRIS GROUP, INC.  
       
 
By:
/s/ Daniel B. Wolfe  
    Name:  Daniel B. Wolfe  
    Title:  Chief Operating Officer  
       
 
       
 
By:
/s/ Daniel B. Wolfe  
    Daniel B. Wolfe  
       
 
       
 
By:
/s/ Douglas W. Jamison  
    Douglas W. Jamison  
       
 
       
 
By:
/s/ Alexei Andreev  
    Alexei Andreev  
       
 
       
 
By:
/s/ Misti Ushio  
    Misti Ushio