Here's a short story:

ATLANTA, Georgia (CNN) -- Health and Human Services' acting secretary has appointed Dr. Richard Besser as the interim director for the Centers for Disease Control and Prevention. 

William Gimson will return to his position as the CDC's chief operating officer. 

He replaces William Gimson, who took over as interim CDC director at noon on January 20. 

Gimson notified CDC employees that HHS acting secretary Charles E. Johnson had announced the appointment. 

Gimson replaced Dr. Julie Gerberding, who was the head of the CDC from 2002 until two days ago. 

Gerberding, along with other senior officials, also resigned on January 20, when Barack Obama and his administration took over. 

Past HHS secretary Michael Leavitt said that the interim directors would take over until the next HHS nominee -- former Sen. Tom Daschle -- is confirmed and makes the permanent appointments. 

Gimson told employees he's returning to his post as the CDC's chief operating officer. The CDC usually has a physician as its director, which Gimson is not. 

According to the biography posted on the CDC Web site, Besser's last position at the CDC was as the director of the Coordinating Office for Terrorism Preparedness and Emergency Response, where he was responsible for public health emergency preparedness and emergency response activities. 

According to CDC sources, Besser was seeing patients when he learned of his new position. In addition to heading the CDC bioterrorism preparedness division, he is a practicing pediatrician. 

 (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What position is being replaced?
Guess: director for the Centers for Disease Control and Prevention

Question: Who is he replacing?
Guess: William Gimson

Question: Why is he being replaced?
Guess: William Gimson will return to his position

Question: What was his position?
Guess: the CDC's chief operating officer

Question: Have there been resignations in the agency?
Guess: yes

Question: When?
Guess: January 20

Question: When does the new person start at the agency?
Guess: noon on January 20

Question: Is there a new permanent person for the job?
Guess: Yes

Question: who?
Guess: Sen. Tom Daschle

Now answer the following question in the same format.

Question: What was Besser doing when he found out he had a new job?

seeing patients