Purdue University: PhD in Second Language Studies /ESL 4-5 years. Students may be full-time or part-time and begin the program at the beginning of the fall or spring semester. PhD Program : College of Liberal Arts : Purdue University Oklahoma State University: PhD in English with a specialization in Teaching English as a Second Language (TESL) &/or Linguistics OSU English Dept TESL Program Georgia State University: EdS in English as a Second Language (ESOL) Educational Specialist Degree Programs — College of Education — Georgia State University University of Essex: PhD (part-time research degree) University of Essex :: Postgraduate prospectus :: Postgraduate study: postgraduate courses Northcentral University: EdD or PhD in English as a Second Language (ESL)/English for Speakers of Other Languages (ESOL) NCU Online Master's and PhD Programs: Business | Education | Psychology Walden University: PhD in Education (self-designed) College of Education and Leadership | Walden University