Write a list of the most rewarding things that you have received from your teaching career. Include your feelings about helping students, watching them succeed and being a part of their lives. Include your relationships with other teachers and the mutual interest that each of you have in the success and future potential of your students. Ask yourself about the things that have meant the most to you and include those things on your list.
List the biggest challenges that you have faced as a teacher. Include information about working with parents, other teachers and the need for you to motivate your students. List the responsibilities of being a teacher that your reader may have not considered before. As an example, you may include that teaching requires you to understand your subject, as well as your student's understanding of the subject.
Write your bio in the third person, in which the writer composes the work from the view of an observer. Include information from your lists to flesh out your bio. Make every word count in order to keep your bio only a few lines long. Avoid unnecessary or repetitive description. Focus on the most important points about teaching and include as much information as possible in each sentence. For instance, you may write a sentence that reads, "An effective teacher is a motivator of children, diplomat to faculty and friend to parents."
Reread and revise your bio several times. Eliminate extraneous words or phrases, and combine ideas where you can. Remember that readers may not bother to read your bio if it is too long or too confusing. Revise it until it is simple, short and informative. Also, eliminate ideas that you can assume the reader already knows, such as that the job of a teacher involves educating children. As an example, you may decide that your reader will already understand that a teacher's responsibilities include motivating children and working with parents. In this case, you may change your sentence to read that, "A teacher is a diplomat between student needs and faculty resources, advocating for the resources that assist in your children's education."