Otto Seinmann (SN: 00806-95321-PG) was a junior commissioned officer of the UNSC Navy, serving aboard the CMA Season of Plenty in 2489. Seinmann strongly resented Crewman Apprentice Preston J. Cole, due to the fact that Seinmann felt Cole's frequent reading of the ship's library was some kind of "act".
On September 22, 2489 as Season of Plenty was preparing to jump to slipspace, the ship's new AI Lorelei shut herself down for routine maintenance. Rather than rebooting the backup intelligence, Lieutenant Commander Nevel ordered Ensign Seinmann to do the slipspace calculations by hand. Seinmann, having other ideas, ordered Preston Cole to do most of the work for him instead.
When Lorelei reappeared, she informed Nevel that Seinmann's initial calculations were very rough. When Nevel found out that Seinmann had made Cole do his work, he was initially angry and disgusted, but was pleasantly surprised to find that Cole had actually come up with a new method for calculating slipspace input parameters. Thoroughly impressed, Nevel and Lorelei recommended Cole for Luna Officer Candidate School later that year. Nevel ordered Seinmann to the bridge, to "remind him of the level of mathematical expertise we expect of our officers on the Plenty."
Despite running afoul of Nevel, Seinmann received a positive evaluation on the ship's bi-annual personnel review that November. Seinmann was evaluated as having performed "above average," and was promoted to Lieutenant, Junior Grade and transferred to the CMA Laden.