Ken Duffy
I am a graduate student in media studies at ETU, focusing on social networking and business, with a special interest in viral marketing and brand awareness. I've been active in a number of online communities and in participating in social networking more or less since it began. I am also the editor of Emusicality, an online magazine and forum dealing with new models for the promotion and marketing of music. My current interests include all kinds of music and its place in our culture today.

Suzy Dire is a professional actor who has appeared in many TV shows and movies.  More information and a full list of credits can be found on her IMDB and Wikipedia pages. Suzy is most well-known for her acting in Web videos, such as Jane Wren's Internet musical "My Very Merry Musical Blog", and in the TV show that she writes, stars in and co-produces, Running Hot and Cold. She is also a very active social networking fan, most prominently on Twitter. For more press, contact information and her blog, check out her website at http://suzydire.com.

Tanya Stokes
Tanya was born in Kent, but spent most of her childhood in Essex. She took a degree in philosophy at the University of Sussex, and then spent the next few years teaching English in various countries, including France, Italy and Germany. She eventually settled in Lisbon, where she took the University Diploma in English language teaching. A short time later she became director of the In-House school in Lisbon. Two years after that she was appointed marketing director for the In-House Portuguese Group of schools. She is currently chief executive of the IHP Group, which consists of 10 companies, including New Solutions (see www.ihp.com). Tanya's interests include travel and jazz music.

Look at the examples. We can combine the information from two sentences into one sentence.

Suzy is a professional actor. She has appeared in many TV shows.
Suzy is a professional actor who has appeared in many TV shows.

In the new sentence, who (a relative pronoun) represents she, Suzy.

Look at more examples:
Jerry is a business executive who has worked in different companies. (who is used to represent people)
This is a program that allows people to do video conferencing. (that or which represents things)
This is the university where I studied economics.  (where represents places)