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. 

 QUESTIONS:

Q1:
1. What position is being filled by someone new?
2. What role is a replacement taking over in?
3. For what position has a replacement been called in?
Q2:
1. Who is Richard Besser replacing?
2. Who is Richard Besser taking over for?
3. Who is being replaced in their role by Richard Besser?
Q3:
1. Why is William Gimson being replaced?
2. What is the reason for William Gimson's replacement?
3. For what reason is someone else taking over William Gimson's role?
Q4:
1. What position is WIlliam Gimson returning back to?
2. What role is William Gimson returning to?
3. What was William Gimson's original role at the CDC?
Q5:
1. Have there been any resignations at the CDC?
2. Have any employees of the CDC quit?
3. Has anyone at the CDC left their position?
Q6:
1. When did people quit the CDC?
2. When did a number of resignations fall at the CDC?
3. On what date did some CDC officials hand in their resignations?
Q7:
1. WHen does Richard Besser start at the CDC?
2. When does Richard Besser's position at the CDC begin?
3. At what precise moment does Richard Besser take over at the CDC?
Q8:
1. 
2. 
3. 
Q9:
1. Who is taking over as Secretary of Health and Human Services?
2. Who has been appointed as the new Secretary of Health and Human Services?
3. Who is now the acting Secretary of Health and Human Services?
Q10:
1. What was Richard Besser doing when he learned that he had a new job?
2. What was Richard Besser in the middle of when he learned of his new appointment?
3. What was Richard Besser in the middle of when he learned he'd been appointed to a new position?
Q11:
1. What does Richard Besser do other than being a pediatrician?
2. In addition to employment as a pediatrician, what other jobs does Richard Besser have?
3. How is Richard Besser employed other than as a pediatrician?
