evidence: While employers shouldn’t privilege parents over other workers, too often they end up doing the opposite, usually subtly, and usually in ways that make it harder for a primary caregiver to get ahead. Many people in positions of power seem to place a low value on child care in comparison with other outside activities. Consider the following proposition: An employer has two equally talented and productive employees. One trains for and runs marathons when he is not working. The other takes care of two children. What assumptions is the employer likely to make about the marathon runner? That he gets up in the dark every day and logs an hour or two running before even coming into the office, or drives himself to get out there even after a long day. That he is ferociously disciplined and willing to push himself through distraction, exhaustion, and days when nothing seems to go right in the service of a goal far in the distance. That he must manage his time exceptionally well to squeeze all of that in.