Ill. Admin. Code tit. 38, § 100.90
a) A Party may be represented by an attorney who is licensed in Illinois or by an attorney otherwise permitted by law to practice in the State. Attorneys who appear in a representative capacity must file a written notice of appearance setting forth:
2) The name, address, and email address of the Party represented; and
e) Any individual may appear on his or her own behalf.
2) Substitution of written argument in place of oral argument; or