From The Time Machine To There Will Be Time

In HG Wells's The Time Machine, it suffices that a single "Time Traveler" visits two far future periods and returns to the late nineteenth century, then departs a second time, never to return. End of story. In Poul Anderson's There Will Be Time, two rival organizations repeatedly move backwards and forwards in time and chronokinesis becomes the basis of interstellar travel. In a single operation, three thousand travelers from different periods come together to mount a military attack in the late twenty-second century. This includes parachutists jumping out of planes in the twentieth century and time traveling, while falling, until their "chronologs" indicate the target date.

Anderson's mutant time traveler Jack Havig receives advice from teams of non-time-traveling scholars and scientists both in the twentieth century and in the Maurai Federation even though such advisors are obliged to keep the secret of time travel. It would go against the grain for scientists to keep secrets.

Other examples in sf:

Martin Saunders suppresses his discovery of time projection in Anderson's "Flight to Forever";

the immortal Hanno confides in just one twentieth-century scientist in Anderson's The Boat Of A Million Years;

John Hillary Dane in some stories by James Blish orders his astronomers not to publish their discovery of Beta Solis.

Havig's advisors can be told that they are contributing to a transcendent future for mankind. Finally, for now, Anderson's time traveler, Caleb Wallis, like Wells's Time Traveler, disappears into time near the end of the story - and Wallis gave Wells the time travel idea. Their names are strikingly similar.