Task: Question Answering
Input (English): Passage: As Greeneville ascended to periscope depth, Waddle checked the sonar displays and the fire control station monitors, but reported later that he heard and saw nothing to suggest that the previously detected vessels in the area were now any closer to the submarine's position than had been reported before the submarine began the high speed maneuvers. Because the AVSDU was not working, Greeneville's executive officer, Lieutenant Commander Gerald K. Pfeifer, entered the sonar room and observed the contacts on the sonar screens.  Pfeifer then stood in the doorway between the sonar and control rooms, but did not communicate any updated sonar information to Waddle in the control room.  At 13:34, sonar gained a new contact, designated S-14.  Because Greeneville had not maintained a steady, slow course for a sufficient amount of time, the sonar data available to the Fire Control Technician of the Watch did not allow  accurate determination on Ehime Maru's range or course.  Also, due to time constraints placed by Waddle, the ship did not perform normal maneuvers which would be used to obtain accurate course and range information on the sonar contacts prior to proceeding to periscope depth.At 13:38, Greeneville reached periscope depth (about 60 feet (18 m) below the surface).  At this time, Ehime Maru was about 2,315 yards (2.117 km) or 1.14 nautical miles (2.1 km) away from the submarine and heading in her direction.  Although sonar data began to more accurately depict Ehime Maru's true range and bearing at this point, this was not evident to the sonar operators.  Lieutenant, Junior Grade Michael J. Coen, the officer of the deck, conducted an initial low  magnification periscope search of the area and sighted no nearby ships.  
Waddle then took the periscope before Coen could complete the normal high magnification search.  Since waves were washing over the periscope, Waddle ordered the submarine to go up another few feet to increase the distance the periscope can view.  Waddle then looked through the periscope at the area where he believed the reported surface contacts to be (possibly in error).  Although Ehime Maru was at this point heading toward Greeneville's location, Waddle failed to see the ship.  Regulations mandated that Waddle conduct a three-minute, 360-degree periscope scan before executing the emergency main ballast blow maneuver.  Waddle, however, aware that they were still behind schedule, conducted a short scan, searching primarily in the sector where he believed
the known contacts were located, noted that the haze was still present, and saw no ships in the vicinity.  At the end of his scan, Waddle announced to the control room crew, "I hold no visual contacts." Waddle later explained how he conducted his periscope search:. 
Question: What is the first name of the person who stood in the doorway between the sonar and control rooms, but did not communicate any updated sonar information to Waddle?
Output (English): Gerald.